RSTC1000 HMI/PLC Design Guide WEB CONTROL
Contents
1. 5 Diagnostics 5 TUN Y gt 6 ST 0 a en nn ee nnnm nnnm 8 Display rr 9 CONO Nr o 9 Signal Selection 10 Diameter Calibratio no 10 Tension Calibration MMMMMMMMMMMMMMMMMMMMyMyyMMHMMMMMMMM MMM 11 Warranty ee FORM NO L 21208 C 0908 ii MODBUS RS485 COMMUNICATIONS NOTE This manual assumes familiarity with the Modbus RTU over Serial Line protocol If you are not familiar with this protocol then the following documents must be read Modbus Application Protocol Specification and Modbus over Serial Line Specification amp Implementation Guide found at http www modbus org Modbus RTU is a master slave protocol that allows the RSTC1000 to send information only after it has been re quested from the master device typically the RSTC Operator Panel ROP Programmable Logic Controller PLC or Human Machine Interface HMI There can be up to 247 devices on one network all communicating with just one master Each device on the network must share the same communication settings and have a unique address in the range of 1 to 247 with the exception of the master which does not require an address The RSTC1000 Modbus RTU communication settings are as follows Settings ___Options_1Default Network Address Range _ 1 to 247 Baud Rates 4800 9600 14400 19200 38400 56000 19200 Stop Bits 1 odd or even parity 2 no parit These settings can be changed via2. 8 65536 19524 1000 543 812 lbs 33 34 Load Cell 2 Tension Floating point number sent as long integer 1000 in units of lbs read only tension range is 0 000 to 10 000 000 Ibs Example 543 000 Ibs Register 33 8 msw Register 34 18712 Isw Load Cell 2 Tension 8 65536 18712 1000 543 000 Ibs 5 FORM NO L 21208 C 0908 35 Control Output Floating point sent as integer 10 read only Control Output range is 0 0 to 100 0 Example 45 6 Register 35 1 msb 200 Isb Control Output 1 256 200 10 45 696 36 37 Roll Diameter Floating point number sent as long integer 1000 in units of inches read only diameter range is 0 000 to 400 000 Example 34 835 inches Register 36 0 msw Register 37 34835 lsw Roll Diameter 0 65536 34835 1000 34 835 inches 38 Run Stop Sent as integer read amp write Run Stop values are 1 run and O stop Writing a 1 to the RSTC1000 will place it in the run mode and writing a O will place it in the stop mode Reading this register provides the RSTC1000 s current operating mode Example 1 Register 38 O msb 1 Isb 39 Splice A Sent as integer read amp write Write 1 to make Control Output A the controlling output and Control Output B the standby output Register 39 can be read immediately after initially writing 1 and the returned value will be 1 for approximately one second before returning to zero Example 1 Regist
3. Tension Floating point number sent as long integer 1000 in units of lbs read amp write Tare Tension is typically set to O and represents the web tension at the tare condition when the load cells measure only the weight of the tension sensing roller and its associated hardware 100 101 Span Tension Floating point number sent as long integer 1000 in units of lbs read amp write Span Tension has a range of 1 to 10 000 Ibs and represents the load seen by the load cells when a known web tension is applied that is less than the Maximum Tension Setpoint 93 Load Cell Measure Flag Sent as integer read amp write Load Cell Measure Flag is only used after Tare Tension and Span Tension registers have been written 1 Remove any web tension from the tension sensing roller and then write a 4 to Load Cell Measure Flag This calibrates the load cell tare condition 2 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare calibration takes 10 seconds Calibration step is complete when flag 0 3 Apply the web tension load that was sent to Span Tension register and then write a 5 to Load Cell Measure Flag This calibrates the load cell span condition FORM NO L 21208 C 0908 12 4 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the span calibration takes 6 seconds Calibration step is complete when flag 0 5 R
4. read amp write Display Units has values of O for Imperial English and 1 for Metric Display Units has no effect on the RSTC as it only stores the value and register values are communicated in Imperial units only Any Imperial to Metric or Metric to Imperial conversion is done in the HMI or PLC Example 1 Metric Register 77 O msb 1 Isb 79 Language Sent as integer read amp write Language has values of O for English 1 for Spanish 2 for French 3 for German and 4 for Italian Language is used primarily to select the language in which the RSTC Operator Panel dis plays text and has no effect on the RSTC Example O English Register 78 O msb O Isb CONTROL 80 Panel Write Enable Sent as integer read amp write Panel Write Enable has values of O for disable and 1 for enable RSTC1000 sets this register to O whenever the RSTC Communications Software is connected to the RSTC1000 An HMI can read this register and when equal to O any values sent by the HMI will be ignored by the RSTC1000 After the RSTC Communications Software is disconnected the RSTC1 000 sets this register to 1 and the HMI can again send values to the RSTC1000 This handshaking can be used to prevent two devices from sending register value changes to the RSTC1000 at the same time Example 1 Enable Register 79 O msb 1 Isb 81 Manual Automatic Mode Sent as integer read amp write Manual Automatic Mode has a value of O for Manual and 1 fo
5. 00 Ibs Maximum Tension Setpoint value must be greater than Minimum Tension Setpoint value Read the current maximum tension setpoint or write a new maximum tension setpoint value Example 324 742 lbs Register 75 4 msw Register 76 62598 lsw Tension Setpoint 4 65536 62598 1000 324 742 lbs 77 Tension Calibration Set Sent as integer read amp write Tension Calibration Set has values of 1 for Calibration Set 1 2 for Calibration Set 2 and 3 for Calibration Set 3 Writing a value to this register selects the desired calibra tion set Example 3 Tension Calibration Set 3 Register 80 O msb 3 Isb 11 FORM NO L 21208 C 0908 When calibrating the tension sensor signal the registers for each calibration set must be written in the order shown here Calibration Set 1 94 95 Tare Tension Floating point number sent as long integer 1000 in units of lbs read write Tare Tension is typically set to O and represents the web tension at the tare condition when the load cells measure only the weight of the tension sensing roller and its associated hardware Example 324 742 lbs Register 94 4 msw Register 95 62598 lsw Tare Tension 4 65536 62598 1000 324 742 lbs 96 97 Span Tension Floating point number sent as long integer 1000 in units of lbs read amp write Span Tension has a range of 1 to 10 000 lbs and represents the load seen by the load cells when a known web tension is appli
6. 256 89 102 8 9 52 Stabilization Floating point number sent as integer 10 read amp write Stabilization has a range of 1 0 50 0 Example 5 3 Register 52 O msb 53 Isb Stabilization 0 256 53 102 5 3 53 Initial Adaptation Floating point number sent as integer 10 read amp write Initial Adaptation has a range of 1 0 20 0 Example 11 4 Register 53 O msb 114 Isb Initial Adaptation 0 256 114 102 11 4 54 Splice Adaptation Floating point number sent as integer 10 read amp write Splice Adaptation has a range of 1 0 20 0 Example 11 4 Register 54 O msb 114 Isb Splice Adaptation 0 256 114 10 11 4 55 Adaptation Rate Floating point number sent as integer 10 read amp write Adaptation Rate has a range of 2 0 20 0 Example 11 4 Register 55 O msb 114 Isb Adaptation Rate 0 256 114 10 11 4 56 Remote Tension Setpoint Enable Sent as integer read amp write Remote Tension Setpoint Enable has values of O for Off and 1 for On Set to 1 for the Tension Setpoint value to be read from the Remote Tension Setpoint analog input Set to O for the Tension Setpoint value to be sent over the Modbus network Example 1 Register 60 O msb 1 Isb 7 FORM NO L 21208 C 0908 SETUP 60 Tension Monitor Enable Sent as integer read amp write Tension Output Enable has values of O for Off and 1 for On Set to 1 for actual tension to be availabl
7. Q 0 5 W LTR User supplied line termination resistor Power Indicator Reset Communication Indicator Communication Error Indicator 00019 1SY Two Wire RS485 Connections RSTC1000 Figure 2 RSTC1000 PLC or HMI DC Common Non Inverted Tx Rx Inverted Tx Rx Four Wire RS485 Connections RSTC1000 PLC or HMI DC Common RxB RxA TxB TxA Modbus RS485 Connections FORM NO L 21208 C 0908 2 RSTC1000 MODBUS TABLE OF REGISTERS Register Name nme Page po beta numba Feasony a 35 pemoma son e ms Fotbimeter aso 6 m as frame 6 e9 oie Feaanmriel 6 Ho fpices Reaarte 6 81 aan ReadOnly 6 13 44 raper Tension Setpoint Read Only 6 a5 flaper Tension Enable Readme 6 e ension Monitor Enable Read Write la ension Alarm Tolerance Read Write 8 Alarm Output Type Read Write la Register Name Hype Page orque Actuator Read Write la orque Actuator Inertia Read Write la 65 ension Zone Selection Read Write Read Write A Read Write Read Write eb Material Selection Read Write o Read Write Read Write Read Write co Read Write co Read Write Read Write Manual Automatic Mode Read Write m Manual Output Level Read Write 8 Alarm Acknowledge Write Only 10 3 184 Output On Off Read Write Bs Run Stop Signal Read Write B7 Diameter Sensor Installed Write Only B8 Diameter Core Size Read Write i Read Write 10 pene v Read Write
8. TER CALIBRATION When calibrating the roll diameter signal send registers 87 through 90 in the order shown here 87 Diameter Sensor Installed Sent as integer write only Diameter Sensor Installed has a value of O for no sensor installed and 1 for sensor installed When Diameter Sensor Installed is set to 0 values for registers 89 and 90 are ignored and Roll Diameter register is always O Example 1 Register 87 O msb 1 Isb 88 Diameter Core Size Floating point value sent as integer 10 in units of inches read amp write Core Size is the outside diameter of roll s core or any roll diameter that is smaller than the roll diameter used for Large Roll Size It has a range of 0 0 to 50 0 inches Example 3 5 inches Register 88 O msb 35 Isb Core Size 0 256 35 10 3 5 inches 89 Diameter Large Roll Size Floating point value sent as integer 10 in units of inches read amp write Large Roll Size is the outside diameter of any roll used for diameter calibration that is larger than the diameter used for Core Size It has a range of 0 0 to 400 0 inches Example 42 7 inches Register 89 1 msb 171 Isb Large Roll Size 1 256 171 10 42 7 inches FORM NO L 21208 C 0908 10 90 Diameter Measure Flag Sent as integer read amp write Diameter Measure Flag is only to be used after registers 87 88 and 89 have been written 1 Apply the voltage representing the Core Size to the Diameter Sensor Input termi
9. U rn Io lt lt gt lt lt 5 2 g Z g S 2 s 2 c lo 3 3 a 3 3 g lt E Q o E lic 3 15 2 1313 S O15 Oo O o os Z lo S O lt m o 9 o 5 S le 5 Oo c 5 2 p y gis amp s S 218 g g g a 2 o 3 o o 9 9 5 3 D 2 2 ns w 2 a o ZU o o N O Diameter Measure Flag 73 74 i i 75 76 Maximum Tension Setpoint Reaarwrite 1 Reaarwrite 11 Reaamrie 12 Reaamrie 12 Read Write 11 Y IN oe ension Calibration Set 94 95 are Tension Calibration Set 1 Reaamrie 1 Read 1 Reaarie 1 Reaamrie 13 Resamrie 13 96 97 m Span Tension Calibration Set 1 98 99 m are Tension Calibration Set 2 100 101 nm Span Tension Calibration Set 2 102 103 are Tension Calibration Set 3 5 E g gt 3 O E D 3 a o 5 D o o S 5 a a Zr 9 m 9 m o e o 5 2 O 2 o g o o 2 n D 2 o ER EN e al Co Ze D 3 a E o o 5 FORM NO L 21208 C 0908 RSTC1000 MODBUS REGISTERS All values written to or read from the RSTC1000 must be in Imperial units Conversion of values from other units of measure are done within the HMI or PLC The following Modbus registers are numbered per the Modbus standard Many PLCs use an alternate numbering scheme and the Modbus register numbers can be converted to the PLC numbering scheme by adding 40 001 to each Modbus register num
10. ber Common Definitions and Abbreviations Isb least significant byte msb most significant byte Isw least significant word msw most significant word byte 8 bits 0 255 range word 2 bytes 0 65535 range PRODUCT INFORMATION 1 4 Product Name Sent as ASCII values read only Example RSTC1000 Register 1 R msb Register 2 T msb Register 3 1 msb Register 4 O msb 6 7 Product Number Sent as long integer read only Example 964523 Register 6 14 msw Register 7 47019 lsw 964523 14 65536 47019 8 9 Serial Number Sent as long integer read only Example 1234567 Register 8 18 msw Register 9 54919 lsw 1234567 18 65536 54919 10 11 Software Part Number Sent as long integer read only Example 12345 Register 10 0 msw Register 11 12345 Isw 12345 0 65536 12345 12 Software Revision Sent as ASCII value read only Example A Register 12 0 msb 65 Isb FORM NO L 21208 C 0908 Mopsus COMMUNICATION PARAMETERS Writing to registers 15 18 changes the communication parameters New paramter values take effect immediately after writing to register 19 or after turning the RSTC1000 power off and back on 15 Baud Rate Sent as integer read amp write Supported baud rates are 4800 9600 14400 19200 38400 56000 Example 19200 Register 15 75 msb O Isb 19200 75 256 0 16 Device Address Sent as integer read write Address values ar
11. e 1 247 Example 24 Register 16 O msb 24 Isb 17 Parity Sent as integer read amp write Parity values are 1 even 2 odd 3 none Example 3 Register 17 O msb 3 Isb 18 Stop Bits Sent as integer read amp write Stop Bit values are 1 1 stop bit 2 2 stop bits Example 2 Register 18 0 msb 2 Isb 19 Remote Communications Reset Sent as integer write only Writing a 1 will cause RSTC1000 to begin using updated communication parameters immediately Reading this variable will return a zero Example 1 Register 19 0 msb 1 Isb DiAGNOSTICS 30 Alarm Status Sent as integer read only Web Break value 128 total loss of web tension No Control value 72 control signal output has reached 0 or 100 during automatic operation and web tension is not at set point High Tension value 64 web tension is greater than the high tension limit Low Tension value 32 web tension is less than the low tension limit Max Output value 16 control signal output has reached maximum output limit typically 100 Min Output value 8 control signal output has reached minimum output limit typically 0 Example 32 Register 30 O msb 32 Isb 31 32 Load Cell 1 Tension Floating point number sent as long integer 1000 in units of lbs read only tension range is 0 000 to 10 000 000 Ibs Example 543 812 lbs Register 31 8 msw Register 32 19524 Isw Load Cell 1 Tension
12. e on Control Output B Set to O for the controlling or standby outputs to be available on Control Output B Splice B register command and hardware input is ignored when Tension Output En able is set to 1 Example 1 Register 56 O msb 1 Isb 61 Tension Alarm Tolerance Sent as integer read amp write Tension Alarm Tolerance has a range of 0 100960 Example 2596 Register 61 O msb 25 Isb Tension Alarm Tolerance 0 256 25 25 62 Alarm Output Type Sent as integer read amp write Alarm Output Type has values of O for Normally Open and 1 for Normally Closed Example 1 Register 62 O msb 1 Isb 63 Torque Actuator Sent as integer read amp write Torque Actuator has the following values 1 Pneumatic Brake 2 Pneumatic Clutch 3 Magnetic Particle Brake 4 Magnetic Particle Clutch 5 Electric Brake 6 Electric Clutch 7 Motor Drive System Example 2 Pneumatic Clutch Register 63 O msb 2 Isb 64 Torque Actuator Inertia Sent as integer 100 in units of Ib ft read amp write Torque Actuator Inertia has a range of 0 00 to 100 00 Example 21 37 Ib ft Register 64 8 msb 89 Isb Torque Actuator Inertia 8 256 89 100 21 37 Ib ft2 65 Tension Zone Selection Sent as integer read amp write Tension Zone Selection has values of 1 for Unwind and 2 for Wind Example 2 Pneumatic Clutch Register 65 O msb 2 Isb 66 Minimum Output Sent as intger read amp wri
13. e when flag O 3 Apply the web tension load that was sent to Span Tension register and then write a 8 to Load Cell Measure Flag This calibrates the load cell span condition 4 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the span calibration takes 6 seconds Calibration step is complete when flag O 5 Remove any web tension from the tension sensing roller and write a 9 to Load Cell Measure Flag This checks the load cell tare condition 6 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare check takes 2 seconds Calibration step is complete when flag O Load Cell Calibration Set 3 is now calibrated 13 FORM NO L 21208 C 0908 WARRANTY Warranties Nexen warrants that the Products will be free from any defects in material or workmanship for a period of 12 months from the date of shipment NEXEN MAKES NO OTHER WARRANTY EXPRESS OR IMPLIED AND ALL IMPLIED WARRANTIES INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT NESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty applies only if a the Product has been installed used and maintained in accordance with any applicable Nexen installation or maintenance manual for the Product b the alleged defect is not attributable to normal wear and tear c the Product has not been altered misused or used for purpos
14. ed that is less than the Maximum Tension Setpoint Example 350 000 Ibs Register 96 5 msw Register 97 22320 Isw Span Tension 5 65536 22320 1000 350 000 lbs 93 Load Cell Measure Flag Sent as integer read amp write Load Cell Measure Flag is only used after Tare Tension and Span Tension registers have been written 1 Remove any web tension from the tension sensing roller and then write a 1 to Load Cell Measure Flag This calibrates the load cell tare condition 2 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare calibration takes 10 seconds Calibration step is complete when flag O 3 Apply the web tension load that was sent to Span Tension register and then write a 2 to Load Cell Measure Flag This calibrates the load cell span condition 4 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the span calibration takes 6 seconds Calibration step is complete when flag O 5 Remove any web tension from the tension sensing roller and write a 3 to Load Cell Measure Flag This checks the load cell tare condition 6 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare check takes 2 seconds Calibration step is complete when flag O Load Cell Calibration Set 1 is now calibrated Calibration Set 2 98 99 Tare
15. emove any web tension from the tension sensing roller and write a 6 to Load Cell Measure Flag This checks the load cell tare condition 6 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare check takes 2 seconds Calibration step is complete when flag 0 Load Cell Calibration Set 2 is now calibrated Calibration Set 3 102 103 Tare Tension Floating point number sent as long integer 1000 in units of lbs read amp write Tare Tension is typically set to O and represents the web tension at the tare condition when the load cells measure only the weight of the tension sensing roller and its associated hardware 104 105 Span Tension Floating point number sent as long integer 1000 in units of lbs read amp write Span Tension has a range of 1 to 10 000 Ibs and represents the load seen by the load cells when a known web tension is applied that is less than the Maximum Tension Setpoint 93 Load Cell Measure Flag Sent as integer read amp write Load Cell Measure Flag is only used after Tare Tension and Span Tension registers have been written 1 Remove any web tension from the tension sensing roller and then write a 7 to Load Cell Measure Flag This calibrates the load cell tare condition 2 Read Load Cell Measure Flag to determine when previous calibration step is complete Under normal condi tions the tare calibration takes 10 seconds Calibration step is complet
16. er 39 O msb 1 Isb 40 Splice B Sent as integer read amp write Write 1 to make Control Output B the controlling output and Control Output A the standby output Register 40 can be read immediately after initially writing 1 and the returned value will be 1 for approximately one second before returning to zero Example 1 Register 40 O msb 1 Isb 41 Adaptation Floating point number sent as integer 10 read only Read the current calculated adaptation value Used for diagnostic work Adaptation ranges from 0 0 to 100 0 Example 8 9 Register 41 O msb 89 Isb Adaptation 0 256 89 10 8 9 43 44 Taper Tension Setpoint Floating point number sent as long integer 1000 in units of lbs read only range is 0 000 to 10 000 000 Ibs but restricted by Maximum and Minimum Tension Setpoint values Reads the calculated taper tension setpoint which decreases as roll diameter increases calculation is always performed regard less of Taper Tension Enable Taper Tension Setpoint is a function of Taper Factor and a condition of Taper Delay Example 543 812 lbs Register 43 8 msw Register 44 19524 Isw Taper Tension Setpoint 8 65536 19524 1000 543 812 lbs TUNING 45 Taper Tension Enable Sent as integer read amp write Taper Tension Enable has values of O for off and 1 for on When set to 1 web tension will decrease with increasing roll diameter as a function of Taper Factor and a condition of Tap
17. er Delay when set to O web tension remains at Tension Setpoint value Example 1 Register 45 O msb 1 Isb FORM NO L 21208 C 0908 6 46 47 Tension Setpoint Floating point number sent as long integer 1000 in units of lbs read amp write range is 0 000 to 10 000 000 Ibs but restricted by Maximum and Minimum Tension Setpoint values Read the current tension setpoint or write a new tension setpoint value Example 543 812 lbs Register 46 8 msw Register 47 19524 Isw Tension Setpoint 8 65536 19524 1000 543 812 Ibs 48 Taper Sent as integer read amp write Taper Factor has a range of 0 to 100 Taper Factor controls how much the tension setpoint is decreased for an increase in roll diameter Larger values of Taper Factor will increase the rate of de crease and smaller values will decrease the rate of decrease A value of O will result in no tension setpoint decrease Example 37 Register 48 O msb 37 Isb 49 50 Taper Delay Floating point number sent as long integer 1000 in units of inches read amp write range of 0 000 to 100 000 This value specifies the roll diameter at which tension tapering is to begin Example 34 835 inches Register 49 O msw Register 50 34835 Isw Taper Delay 0 65536 34835 1000 34 835 inches 51 Gain Floating point number sent as integer 10 read amp write Gain has a range of 0 0 10 0 Example 8 9 Register 51 O msb 89 Isb Gain 0
18. es other than those for which it was intended and d Buyer has given written no tice of the alleged defect to Nexen and delivered the allegedly defective Product to Nexen within one year of the date of shipment Exclusive Remedy The exclusive remedy of the Buyer for any breach of the warranties set out above will be at the sole discretion of Nex en a repair or replacement with new serviceably used or reconditioned Product or issuance of credit in the amount of the purchase price paid to Nexen by the Buyer for the Products Limitation of Nexen s Liability TO THE EXTENT PERMITTED BY LAW NEXEN SHALL HAVE NO LIABILITY TO BUYER OR ANY OTHER PER SON FOR INCIDENTAL DAMAGES SPECIAL DAMAGES CONSEQUENTIAL DAMAGES OR OTHER DAM AGES OF ANY KIND OR NATURE WHATSOEVER WHETHER ARISING OUT OF BREACH OF WARRANTY OR OTHER BREACH OF CONTRACT NEGLIGENCE OR OTHER TORT OR OTHERWISE EVEN IF NEXEN SHALL HAVE BEEN ADVISED OF THE POSSIBILITY OR LIKELIHOOD OF SUCH POTENTIAL LOSS OR DAMAGE For all of the purposes hereof the term consequential damages shall include lost profits penalties delay images liquidated damages or other damages and liabilities which Buyer shall be obligated to pay or which Buyer may incur based upon related to or arising out of its contracts with its customers or other third parties In no event shall Nexen be li able for any amount of damages in excess of amounts paid by Buyer for Products or services as to which a breach
19. nal and then write a 1 to Diameter Measure Flag register RSTC1000 will measure this voltage and calibrate the smaller roll size 2 Read Diameter Measure Flag to determine when previous calibration step is complete Calibration step is complete when flag 0 3 Apply the voltage representing the Large Roll Size to the Diameter Sensor Input terminal and then write a 2 to Diameter Measure Flag register RSTC1000 will measure this voltage and calibrate the larger roll size 4 Read Diameter Measure Flag to determine when previous calibration step is complete Calibration step is complete when flag 0 The diameter measurement is now calibrated and ready for use TENSION CALIBRATION Set the Maximum Tension Setpoint before calibrating the tension sensors Afterwards re calibration of tension sensors is necessary whenever Maximum Tension Setpoint is changed 73 74 Minimum Tension Setpoint Floating point number sent as long integer 1000 in units of lbs read amp write range is 0 000 to 10 000 000 Ibs Minimum Tension Setpoint value must be less than Maximum Tension Setpoint value Read the current minimum tension setpoint or write a new minimum tension setpoint value Example 55 742 lbs Register 73 0 msw Register 74 55742 Isw Tension Setpoint 0 65536 55742 1000 55 742 lbs 75 76 Maximum Tension Setpoint Floating point number sent as long integer 1000 in units of lbs read amp write range is 0 000 to 10 000 0
20. nexen WEB CONTROL PRODUCTS User Manual 2252 E RSTC1000 HMI PLC Design Guide FORM NO L 21208 C 0908 DANGER Read this manual carefully before installation and operation Follow Nexen s instructions and integrate this unit into your system with care This unit should be installed operated and maintained by qualified personnel ONLY Improper installation can damage your system or cause injury or death Comply with all applicable codes In accordance with Nexen s established policy of constant product improvement the specifications contained in this manual are subject to change without notice Technical data listed in this manual are based on the latest information available at the time of printing and are also subject to change without notice Technical Support 800 843 7445 651 484 5900 WWW nexengroup com Nexen Group Inc 560 Oak Grove Parkway Vadnais Heights MN 55127 ISO 9001 Certified men i Copyright 2008 Nexen Group Inc TABLE OF CONTENTS Modbus RS485 CommunicationS Connection Diagrams ooo RSTC1000 Modbus Table of RegisterS RSTC1000 Modbus Registers rc Product Information MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMee 4 Modbus Communication Parameters
21. ning of the message byte Parity is used for error detection and is often not necessary as another error detection method Cycli cal Redundancy Checking CRC is also performed on the message byte to check for errors The stop bit marks the end of the message byte Parity can be set for none odd or even Stop Bits must be set to 1 for use with odd or even parity or 2 for use with no parity Load Termination Resistors LTR are necessary to reduce noise and are applied to the devices at the remote ends of the network These resistors can be installed at the RSTC1000 s Modbus RS485 port connector refer to Figure 1 Typical values for LTRs are 150 ohms and 0 5 watts 1 FORM NO L 21208 C 0908 CONNECTION DIAGRAMS Modbus RS485 Port This port is for communicating with the RSTC1000 using the Modbus RTU protocol ROP RSTC over a 2 wire or 4 wire RS485 physical layer Refer to Figure 1 Communication Indicator Yellow indicator visible through top cover will illuminate whenever the RSTC1000 communicates over the RS485 port White RxB Communication Error Indicator Red indicator Yellow RxA visible through top cover will illuminate whenever the Blue TxB RSTC1000 detects an error with a received message Orange TxA Cable Recommendation Shielded 24 awg is always sufficient 4 wire system 1000 m 9600 baud 2 wire system 500 m 9600 baud Termination resistors added externally Recommend 150
22. of contract has been determined to exist The parties expressly agree that the price for the Products and the services was determined in consideration of the limitation on damages set forth herein and such limitation has been specifically bar gained for and constitutes an agreed allocation of risk which shall survive the determination of any court of competent jurisdiction that any remedy herein fails of its essential purpose Limitation of Damages In no event shall Nexen be liable for any consequential indirect incidental or special damages of any nature whatso ever including without limitation lost profits arising from the sale or use of the Products Warranty Claim Procedures To make a claim under this warranty the claimant must give written notice of the alleged defect to whom the Product was purchased from and deliver the Product to same within one year of the date on which the alleged defect first became apparent nexen Nexen Group Inc 800 843 7445 560 Oak Grove Parkway Fax 651 286 1099 Vadnais Heights MN 55127 www nexengroup com ISO 9001 Certified FORM NO L 21208 C 0908 14
23. r Automatic When mode is set to Manual the RSTC1000 control output can be controlled using the Manual Output Level register When mode is set to Automatic the RSTC1000 control output is automatically controlled and writing to Manual Output Level has no effect Example 1 Automatic Register 81 O msb 1 Isb 82 Manual Output Level Sent as integer read amp write Manual Output Level has a range of 0 to 100 When the RSTC1000 is in manual mode writing to this register will immediately change the Control Output s signal level Example 67 Register 82 0 msb 67 Isb 9 FORM NO L 21208 C 0908 83 Alarm Acknowledge Sent as integer write only Alarm Acknowledge has a value of 1 to acknowledge an alarm Writing a 1 to this register will turn off all alarm outputs until the alarm condition is satisfied and occurs again Example 1 Register 83 O msb 1 Isb 84 Output On Off Sent as integer read amp write Output On Off has a value of O for Off and 1 for On Writing to this register will affect both RSTC1000 control outputs Example 0 Output Off Register 84 O msb O Isb SIGNAL SELECTION 85 Run Stop Signal Selection Sent as integer read amp write Run Stop Signal Selection has the following values 1 run stop maintained 2 run stop momentary 3 run only momentary 4 run pulsed encoder 5 run stop signal via Modbus Communications Example 4 run pulsed encoder Register 85 O msb 4 Isb DIAME
24. te Minimum Output has a range of 0 100 Example 32 Register 66 O msb 32 Isb 67 Maximum Output Sent as intger read amp write Maximum Output has a range of 0 100 Example 10 Register 67 O msb 10 Isb 68 Standby Output Sent as intger read amp write Standby Output has a range of 0 100 Example 67 Register 68 O msb 67 Isb 69 Web Material Selection Sent as integer read amp write Web Material Selection has values of 1 for paper and plastic 2 for aluminum and 3 for steel Example 2 aluminum Register 69 O msb 2 Isb FORM NO L 21208 C 0908 8 70 Average Web Width Floating point number sent as integer 10 in units of inches read amp write Average Web Width has a range of 1 0 400 0 inches Example 287 2 inches Register 70 11 msb 56 Isb Average Web Width 11 256 56 10 287 2 inches 71 Maximum Roll Diameter Floating point number sent as integer 10 in units of inches read amp write Large Roll Diameter has a range of 0 0 400 0 inches Example 40 5 inches Register 71 1 msb 149 Isb Average Web Width 1 256 149 10 40 5 inches 72 Minimum Core Roll Diameter Floating point number sent as integer 10 in units of inches read amp write Core Roll Diameter has a range of 0 0 50 0 inches Example 3 5 inches Register 71 0 msb 35 Isb Average Web Width 0 256 35 10 3 5 inches DisPLAY 78 Display Units Sent as integer
25. the RSTC Communications Software or must first be used by the master to es tablish communication with the RSTC1000 and then changed as desired The ROP has been programmed with the same communication parameters and will upon connecting to the RSTC1000 be able to communicate without any changes Because the ROP is a master device there can be no other masters on the same Modbus network Any address in the range of 1 to 247 can be assigned to the RSTC1000 Baud rates which designate the message transmission speed in units of bits per second can be set for 4800 9600 14400 19200 38400 or 56000 The larger the baud rate the less time it takes for a message to travel across the network and the less time a device spends sending or receiving the message However the trade off is typically reduced communication cable length The Modbus standard specifies the maximum communication cable length as 1000 meters using a 4 wire implementation 500 meters for a 2 wire implementation 26 AWG or larger wire shielded at 9600 baud Cable capacitance and wire resistance affect baud rates and as cable lengths in crease so does the capacitance and resistance This can cause a reduction in the speed that a message can travel across the network Each message byte that is sent using the Modbus RTU protocol is eleven bits long with the message data byte being eight bits and then encapsulated by three other bits start parity and stop The start bit marks the begin
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