Two hand Control Products Safety Function
Contents
1. and releasing the reset button is performed This Emergency Stop function is complementary to any other safeguards on the machine and shall not reduce the performance of other safety related functions The safety functions in this example are each capable of con necting and interrupting power to motors rated up to 9A 600VAC The safety functions will meet the requirements for Performance Level d Category 3 PLd Cat 3 per ISO 13849 1 and SIL3 per IEC 62061 and control reliable operation per ANSI B11 19 The stop implemented by each safety function is Stop Category 0 NHP Safety Reference Guide Safety Function Documents GSR 6B 4 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Safety Function Requirements cont Throughout this manual when necessary we use notes to make you aware of safety considerations WARNING Identifies information about practices or circumstances that can cause an explosion in a hazardous environment which may lead to personal injury or death property damage or economic lass TAR Identifies information that is critical for successful IMPORTANT application and understanding of the product ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attentions help you iden2. Guardmaster Safety Relay Model Safety Wiring and Relay Configuration Verification Visually inspect the safety relay circuit is wired as documented in the schematics EN Visually inspect the safety relay rotary switch settings are correct as documented Normal Operation Verification The safety relay system properly responds to all normal Start Stop Estop and Reset Commands Initiate a Start Command by simultaneously pressing both palm buttons Both contactors should energize for a normal machine run condition Verify proper machine status indication and safety relay LED indication Initiate a Stop Command by simultaneously releasing both palm buttons Both contactors should de energize for a normal machine Stop condition Verify proper machine status indication and safety relay LED indication While Stopped only press the left palm button The door should remain closed and locked Both contactors should remain de energized and open for a normal safe condition Verify proper machine status indication and safety relay LED indication Repeat for right palm button Initiate Reset Command Both contactors should remain de energized Verify proper machine status indication and safety relay LED indication Abnormal Operation Verification The Safety Relay system properly responds to all foreseeable faults with corresponding diagnostics Two Hand Run Station Input Tests While Stopped press the left palm button followed by the right 1 sec l
3. Mounting Hole 2 Length MSR125 HP Relay Model Two Hand Control 2 N O Immediate Safety 440R D23171 Outputs N A Auxiliary Outputs N A Delayed Safety Outputs 24V AC DC Power Supply Automatic Manual Reset Removable Terminals Quantity 2 2 2 440R A23209 Bag of 4 4 Pin Screw Terminal Blocks Pd 800F 1YP3 800F 1 Hole Enclosure E Stop Station Plastic PG Twist to Release 40 mm Non Illuminated 2 N C 800FM G611MX10 800F Push Button Metal Guarded Blue R Metal Latch Mount 1 N 0 Contact s 0 N C Contact s Standard Standard Pack Qty 1 1 1 AAOR S12R2 Guardmaster Safety Relay 1 Dual Channel Universal Input 1 N C Solid i State Auxiliary Outputs 1005 C09ZJ23C MCS 100S C Safety Contactor 9A 24V DC NHP Safety Reference Guide gt Safety Function Documents GSR 6B 6 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Setup and Wiring For detailed information on installing and wiring refer to the product manuals listed on the Additional Resources page System Overview The monitors the contacts of the two 800Z palm buttons When the system is running and one hand or both hands move from a palm button the MSR 125 responds by opening its safety contacts removing 24V from the coils of both 100S contactors The contactors open their contacts removing power from t
4. PL OY FFH l h 247E 8 100 High 33 High 65 fulfilled Note that the 800Z palm buttons E Stop and Safety Contactors data includes MTTFd DCavg and CCF data This is because these are electro mechanical devices Electro mechanical devices functional safety evaluations include how frequently they are operated whether they are effectively monitored for faults and properly specified and installed SISTEMA calculates the MTTFd using B10d data provided for the contactors along with the estimated frequency of use entered during the creation of the SISTEMA project This application example presumes that the E Stop is operated or tested once per day ie 365 times per year The DCavg 99 for the contactors was selected from the Output Device table of EN ISO 13849 1 Annex E Direct Monitoring The DCavg 99 for the E Stop was selected from the Input Device table of EN ISO 13849 1 Annex E Cross Monitoring The CCF value is generated using the scoring process outlined in Annex F of ISO 13849 1 The complete CCF scoring process must be done when actually implementing an application A minimum score of 65 points must be achieved A CCF of 65 was entered for practical purposes in each case for this application example Verification and Validation Plan Verification and Validation play an important role in the avoidance of faults throughout the safety system design and development process ISO EN 13849 2 sets the requ
5. are subject to NHP standard Conditions of Sale a copy of which is available on application NHP Safety Reference Guide Safety Function Documents GSR 6B 16
6. button via two auxiliary NC contacts of the 100S contactors The two closed NC contacts confirm that the 100S contactors are properly de energized Once the E Stop button is released and the reset pushbutton is pressed for 250 to 3 seconds then released the GSR SI resets closing its safety contacts The hazardous motion is restarted When the reset button is pressed for less than 250 seconds or longer than 3 seconds the reset signal is ignored and the GSR SI safety contactors remain open This is to prevent inadvertent reset and thwart tie down of the reset button NHP Safety Reference Guide Safety Function Documents GSR 6B 7 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Electrical Schematic 24V MSR 125 OV Al A2 Gry S1 K1 K2 Brn Y1 er C iei 800Z LEFT Y2 Blu Blk S13 Wht S12 G Brn 2 S21 ines 800Z RIGHT S23 Wht S22 1 LT 13 14 4 23 24 A1 A2 S1 S11 S21 F Stop Reset gt gt MM 91 o s12 O7_ O 22 Y32 Reset K1 K2 O 13 LO 34 23 MSRI25 440R D23171 S1 440R S12H2 24 12 Configuration GSR SI the following procedure sets the function of the device 1 Start configuration to overwri
7. for all safety relays in the system Safety Contactor Output Tests While Running remove the contactor feedback from the safety relay All contactors should remain energized Initiate a Stop Command followed by a Reset Command The relay should not restart or reset Verify proper machine status indication and safety relay LED indication NHP Safety Reference Guide gt Safety Function Documents GSR 6B 13 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 GSR Emergency Stop Safety Function Verification and Validation Checklist GENERAL MACHINERY INFORMATION Safety Wiring and Relay Configuration Verification Visually inspect the safety relay circuit is wired as documented in the schematics Visually inspect the safety relay rotary switch settings are correct as documented Normal Operation Verification The safety relay system properly responds to all normal Start Stop Estop and Reset Commands Initiate a Start Command Both contactors should energize for a normal machine run condition Verify proper machine status indication and safety relay LED indication Changes Modifications Changes Modifications Initiate a Stop Command Both contactors should de energize for a normal machine Stop condition Verify proper machine status indication and safety relay LED indication While Run
8. GSR SAFETY FUNCTION DOCUMENTS 2 Hand Control Safety Function Lid 9 Lit VW Lit m a Lit LL LL cc gt Lit LL lt L C QW L Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Table of Contents Introduction C y aaa 63 Important User Information 5 63 N Safety Function Realization 64 General Safety Information 65 Setup and Wiring 5 67 Configuration O 5 C O a 68 Calculation of PFHd C 69 Verification and Validation Plan 6 712 Additional Resources 6 15 Xt Authorised Distributor NHP Safety Reference Guide gt Safety Function Documents GSR 6B 2 oy Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Introduction This Safety Function application note explains how to wire and configure two 800Z zero force palm buttons an MSR 125 two hand control an E Stop a GSR SI Safety Relay and two 100S safety contactors to create a two hand control safety system When the operator places one hand on each button simultaneously within 0 5 sec of each other confirming that the operator is in the pr
9. Rockwell Automation Inc cannot assume responsibility or liability for actual use based on the examples and diagrams No patent liability is assumed by Rockwell Automation Inc with respect to use of information circuits equipment or software described in this manual Reproduction of the contents of this manual in whole or in part without written permission of Rockwell Automation Inc is prohibited NHP Safety Reference Guide Safety Function Documents GSR 6B 3 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Safety Function Realization Risk Assessment The required performance level is the result of a risk assessment and refers to the amount of the risk reduction to be carried out by the safety related parts of the control system Part of the risk reduction process is to determine the safety functions of the machine For the purposes of this document the assumed performance level required PLr is PLd Category 3 From Risk Assessment ISO 12100 1 Identification of safety functions Specification of characteristics of each safety function Determination of required PL PLr for each safety function To Realization PL Evaluation Two Hand Control Safety Function The safety system described in this Safety Function application n
10. Trojan T15 Interlock 8007 IN001 MU How to install and mount the 8007 Touch Button 8007 BR002 Brochure that describes all 800Z Palm Buttons MINOTR INO10 How to install configure commission operate and maintain the MSR 12T Safety Relays 440R IN042 How to install commission operate and maintain the 440R S12R2 Safety Relays 440R UM008 How to install commission operate and maintain MSR42 Systems 440R UM007 How to install commission operate and maintain the MSR45E Expansion Module 440N INO11 How to install commission operate and maintain the SensaGuard NHP Safety Reference Guide gt Safety Function Documents GSR 6B 15 Safety Function Document Disclaimer The information contained in this and any related publications is intended as a guide only Every care has been taken to ensure that the information given is accurate at time of publication Neither NHP nor any of the manufacturers portrayed in this and any related publications accept responsibility for any errors or omissions contained therein nor any misapplications resulting from such errors or omissions Risk assessments should be conducted by authorized persons The purchaser and installer are responsible for ensuring the safety system s incorporating these products complies with all current regulations and applicable standards Products are subject to change without notice and may differ from any illustration s provided All products offered for sale
11. ater Both contactors should remain de energized and open Verify proper machine status indication and safety relay LED indication Repeat for sequence starting with the right palm button While Running remove the Channel 1 wire from the E Stop pushputton Both contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short Channel 1 of the safety relay to 24VDC Both contactors should de energize EE Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short Channel 1 of the safety relay to OVDC Both contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short Channels 1 amp 2 of the safety relay Both contactors should de energize Verify proper machine status indication and safety relay LED indication GSR Logic Solver Tests While Running remove the single wire safety connection between two adjoining safety relays in the system All contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for all safety connections This test is not applicable for single relay circuits While Running turn the logic rotary switch on the safety relay All contactors should remain de energized Verify proper machine status indication and safety relay LED indication Repeat
12. e machine is allowed to run performing its task while then operator is in a safe location with both the operator s hands are placed one on each of two palm buttons When either one or both of the operator s hands are removed from a palm button the MSR 125responds by opening its safety contacts removing power to the hazardous motion stopping the machine to allow the operator to perform some safe task in the guarded area while the machine is stopped and maintained stopped Once this task is completed the operator must move a distance away from the guarded area to access the two palm buttons The operator must place their hands on the two palm buttons simultaneously Responding to this the MSR 125 responds by closing its safety contacts This starts the machine allowing it to perform its task The purpose of the E Stop safety function is straightforward When an urgent need to stop the machine arises the E Stop pushbutton is pressed The GSR SI monitoring the E Stop pushbutton responds by opening its safety contacts removing power from the coils of the two 1008 safety contactors The 100s contacts open removing power from the hazardous motion Bill of Material Catalog Number Description 22 5 mm Type 4 4X 13 IP66 Zero Force Momentary General Purpose 8007 GL2Q5Y Touch Button 10 40V DC and 20 30V AC Input Relay Output 5 Pin QD Yellow Guard 8007 G2AH1 Plastic Mounting Kit for 22 5 mm Hole GP 889D F5AC2 5 Pin Straight QD Cable 22 5 mm
13. he hazardous motion The hazardous motion coasts to a stop The MSR 125 is wired automatic reset As required by standards the MSR125 will only reset if both palm buttons are actuated by an operator s hands with 0 5 seconds of each other simultaneity When the standard s simultaneity requirement is met the MSR 125 closes its safety contacts provided that two auxiliary contacts of the 100S contactors K1 and K2 wired in series between Y1 and Y2 of the MSR125 are closed confirming that both 1005s are properly de energized The closing safety contacts energize the coils of the 100S contactors The hazardous motion is restarted The MSR 125 uses Plausibility check e g use of normally open and normally closed mechanically linked contacts to monitor the 800Z palm buttons for faults The GSR SI monitors the E Stop push button The pulsed outputs of the GSR SI terminals S11 and S21 are run separately through the two E Stop contacts to input terminals 12 and S22 respectively This enables the GSR SI to detect loose wire short to 24V short to GND welded contact and cross channel faults When the E Stop push button is pressed the pulsed output to input circuits are broken The GSR SI responds by opening its safety contacts removing 24V from the coils of the 100S contactors De energized the 100Ss open their contacts The hazardous motion coasts to a stop The GSR S is configured for monitored manual reset 24V is connected to the reset
14. irements for verification and validation It calls for a documented plan to confirm all the Safety Functional Requirements have been met Verification is an analysis of the resulting safety control system The Performance Level PL of the safety control system is calculated to confirm it meets the Required Performance Level PLr specified The SISTEMA software tool is typically utilized to perform the calculations and assist with satisfying the requirements of ISO 13849 1 Validation is a functional test of the safety control system to demonstrate that it meets the specified requirements of the safety function The safety control system is tested to confirm all of the safety related outputs respond appropriately to their corresponding safety related inputs The functional test should include normal operating conditions in addition to potential fault inject of failure modes A checklist is typically used to document the validation of the safety control system NHP Safety Reference Guide gt Safety Function Documents GSR 6B 12 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Two Hand Control Station Safety function verification and validation checklist GENERAL MACHINERY INFORMATION Machine Name Model Number Machine Serial Number Customer Name Test Date Tester Name s Schematic Drawing Number
15. ning press the E Stop pushbutton Both contactors should de energize and open for a normal safe condition Verify proper machine status indication and safety relay LED indication Repeat for all E Stop pushbuttons While Stopped press the E Stop pushbutton initiate a Start Command Both contactors should remain de energized and open for a normal safe condition Verify proper machine status indication and safety relay LED indication Repeat for all E Stop pushbuttons Initiate Reset Command Both contactors should remain de energized Verify proper machine status indication and safety relay LED indication Abnormal Operation Verification The Safety Relay system properly responds to all foreseeable faults with corresponding diagnostics E Stop Input Tests Test Step Validation Pass Fail Changes Modifications While Running remove the Channel 1 wire from the safety relay Both contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short the Channel 1 of the safety relay to 24VDC Both contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short the Channel 1 of the safety relay to OVDC Both contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for Channel 2 While Running short Channels 1 amp 2 ofthe safe
16. ns Guardmaster Safety Relay Troubleshooting Guide Guardmaster Expansion Relay Installation Instructions Guardmaster Expansion Relay Troubleshooting Guide Safety Products Catalog GuardShield Type 4 User Manual Next Generation Guardmaster Safety Relays Heavy Duty Guard Interlock Switch Installation Instructions Trojan T15 Interlock Switch Installation Instructions Safety Interlock Switches Brochure Guardmaster Safety Relay SI Installation Instructions Guardmaster Safety Relays Selection Guide RightSight Photoelectric Sensor Installation Instructions MSR42 Control Module User Manual MSRA5E Safety Relay Expansion Module User Manual SensaGuard Integrated Latch Unique Coded Installation Instructions Touch Button and Guard Installation Instructions Zero Force Touch Buttons Family Brochure MSR12T Safety Relays Installation Instructions Guardmaster Safety Relay Installation Instructions Pub No Description 440G IN007 How to install commission operate and maintain the 440G TZS21UPRH 10000175129 How to install commission operate and maintain the 440R D22R2 Safety Relays 440R TG002 How to troubleshoot the 440RD22R2 Safety Relays 440R IN045 d install commission operate and maintain the 440R EM4R2D Expansion Functional descriptions guidance and wiring for Safety Relays 440K IN008 AERE configure commission operate and maintain MT GD2 Interlock 440K IN003 ne a configure commission operate and maintain
17. oper safe location the two 100s contactors are energized powering the hazardous motion Removing either or both hands will cause the system to turn off the safety contactors The SISTEMA calculations in this document are for the system described here A system using different components or a different configuration would have to be calculated based on its actual components and system structure Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment Safety Guidelines for the Application Installation and Maintenance of Solid State Controls publication SGI 1 1 available from your local Rockwell Automation sales office or online at http www rockwellautomation com literature describes some important differences between solid state equipment and hard wired electromechanical devices Because of this difference and also because of the wide variety of uses for solid state equipment all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable In no event will Rockwell Automation Inc be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment The examples and diagrams in this manual are included solely for illustrative purposes Because of the many variables and requirements associated with any particular installation
18. ote contains two safety functions 1 Two Hand Monitoring Safety Function Power is provided to the hazard only when the operator s hands have been placed on the palm buttons simultaneously and remain on the but tons Power is removed when one or either hand is removed from its palm button 2 E Stop Safety Function The removal of power from the hazard when the safety system detects that the E Stop has been actuated Safety Function Requirements Two Hand Monitoring Safety Function Controlled location of an operator s hands during hazardous motion by requiring the continuous actuation of two palm buttons to enable power to the motor Simultaneity of operation of the two buttons must be within 0 5 seconds per ISO 13851 Upon releasing either or both of the two palm buttons power to the motor will be removed Placing both hands on the palm buttons simultaneously will restart the hazardous motion Faults at the two hand palm buttons wiring terminals or safety controller will be detected before the next safety demand The safe distance location of the two hand control station must be established per ISO 13855 such that the hazardous motion must be stopped before the operator can reach the hazard E Stop Safety Function Pressing the E Stop will stop hazardous and prevent motion by removal of power to the motor Upon resetting the E Stop pushbutton hazardous motion and power to the motor will not resume until a secondary action pressing
19. te with power off turn rotary sitch to position 0 and unit is powered up After power up test WR LED will flash red Set configuration turn rotary switch to MM monitored manual IN 1 LED blinks new setting Note position is set when PWR LED is solid green Lock in configuration by cycling unit power Configuration must be confirmed before operation A white space on the face of the device is provided to record unit setting Enable program mode 0 AM MM Set operation mode E Cycle power to store NHP Safety Reference Guide Safety Function Documents GSR 6B 8 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Calculation of PFHd The Performance Level required PLr for each safety function in this application note project is PLd Cat 3 When configured correctly the two safety functions project can achieve a safety rating of PLe Cat 4 according to EN ISO 13849 1 2008 Project WY IFA Documenigion Salely functor i i iHe heier Zj Edi w Sr ES Salat related stop unichon inifialesd Ey salegaad d The overall Two Hand Control safety function value is shown below Two Hand Control Plr jd PFH 1 h MSR125 Sub System 1 T Sub System 3 NHP Safety Reference Guide Safety Function Documents GSR 6B 9 Safety F
20. tify a hazard avoid a hazard and recognize the consequence SHOCK HAZARD Labels may be on or inside the equipment for example a drive or motor to alert people that dangerous voltage may be present BURN HAZARD Labels may be on or inside the equipment for example a drive or motor to alert people that surfaces may reach dangerous temperatures A General Safety Information Contact NHP to find out more about our safety risk assessment services This application example is for advanced users and IMPORTANT assumes that you are trained and experienced in safety system requirements ATTENTION A risk assessment should be performed to make sure all task and hazard combinations have been identified and addressed The risk assessment may N require additional circuitry to reduce the risk to a tolerable level Safety circuits must take into consideration safety distance calculations which are not part of the scope of this document NHP Safety Reference Guide Safety Function Documents GSR 6B 5 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Functional Safety Description The purpose of the two hand monitoring safety function in this application note is to provide safe and easy running and stopping of a hazardous machine to suit the requirements of a manufacturing process Th
21. ty relay Both contactors should de energize Verify proper machine status indication and safety relay LED indication GSR Logic Solver Tests While Running remove the single wire safety connection between two adjoining safety relays in the system All contactors should de energize Verify proper machine status indication and safety relay LED indication Repeat for all safety connections This test is not applicable for single relay circuits While Running turn the logic rotary switch on the safety relay All contactors should remain de energized Verify proper machine status indication and safety relay LED indication Repeat for all safety relays in the system Safety Contactor Output Tests While Running remove the contactor feedback from the safety relay All contactors should remain energized Initiate a Stop Command followed by a Reset Command The relay should not restart or reset Verify proper machine status indication and safety relay LED indication NHP Safety Reference Guide gt Safety Function Documents GSR 6B 14 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 Additional Resources For more information about the products used in this example refer to these resources Document Guard Locking Switch Installation Instructions Guardmaster Safety Relay Installation Instructio
22. unction Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 The functional safety ratings for the 800Z INPUT subsystem are 5B Two Hand Buttons 33 High 5 fulfilled The functional safety ratings for the MSR 125 LOGIC subsystem are 5E Monitoring Safety Relay MSA125 The functional safety ratings for the 100S OUTPUT subsystem are 5B 1005 Safety Contactor The overall E Stop safety function value is shown below CH E Stop PFH 17h NHP Safety Reference Guide gt Safety Function Documents GSR 6B 10 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 The E Stop Safety function can be modeled as follows INPUT LOGIC OUTPUT PP SPE j assass m mm omm mu m um GNO i E Stop 1 B1 E1 Sub System 3 m oa ee ee ee ee ee ee moo am xb ee ee ee ee a ee ee 1 NHP Safety Reference Guide gt Safety Function Documents GSR 6B 11 Safety Function Documents GSR Two Hand Control Products 800Z Zero Force Buttons MSR125 Safety Relay GSR SI Safety Relay Safety Rating PLd Cat 3 to EN ISO 13849 1 2008 The functional safety ratings for the 100S OUTPUT subsystem are SB Safety Contactors
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