1791-2.12, Analog Block I/ O Module, Installation Instructions
Contents
1. ATTENTION The 249 ohm input current shunt is rated at 0 25 Watts Do not exceed this rating The block I O module has an equipment grounding stud on the lower left side of the module Connect this grounding stud to your equipment ground Torque the nut to 15 in lbs maximum when connecting to your equipment ground when connecting the wire Damage to the module could result ATTENTION Do not overtighten the nut on the grounding stud Refer to Programmable Controller Wiring and Grounding Guidelines 1770 4 1 for further information Installation Instructions Block I O Cat No 1791 462 Table A Wiring Block Designations Designation Description Terminal No L1 ac hot Power Connections N ac neutral GND Chassis ground 21 1 Transducer Power RAV For current input only 25 R BLU Blue wre RIO 6 Connections CLR Clear wire RIO 8 SHD Shield RIO P4 1 0 Connections inVO thru inv3 Voltage Input O through 3 9 13 17 21 Voltage Input RET inO thru Input Retum O through 3 10 14 18 22 RET in3 LT Current Input RET inO thru Input Retum O through 3 10 14 18 22 RET in3 Input Ground GNDinO GNDin3 Channels 0 3 ground 12 16 20 243 out O RET out O puEOUO 27 Retum output O 26 Output 1 29 out 1 RET out 1 9 Retum output 1 284 Not For intemal test only not for 4 5 30 custorrer use Connect chassis ground to equipment grounding stud These are not intemally connec2. major cities worldwide 1791 NAC2 Specifications General Specifications Nurrber of Channels Input Output Resolution Input Band VMctn Overvoltage Protection Input Output ATTENTION The 249 ohminput current shunt is rated at 0 25 Watts Do not exceed this rating Extemal Power Voltage Current Dirrensions Inches Millinneters Isolation Inputs to Outputs Power and Chassis to I O RIO and Chassis to world Power Dissipation Maximum Thermal Dissipation IMaximum Ermronrrental Conditions Operational Ten perature Storage Tenperature Relative Hurridity Conductors Wire Size Category 14 bits full scale inputs 13 bits full scale outputs 140V ac 140V ac 85 132V ac 47 63Hz 150m 6 95H X 2 7W X 3 85D 176 5H X 68 8W X 98D 500V ac 1000V ac 1000V ac 16 9 Watts 57 63 BTU hr Oto 60 C 32 to 140 F 40 to 85 C 40 to 185 F 5 to 95 noncondensing 14 gauge 2rmr stranded nainum 3 64 inch insulation rrexirmum 11 1 You use this conductor category information for planning conductor routing as described in the systemlevel installation manual Publication 1791 2 12 March 1994 Supersedes publication 1791 2 12 December 1992 WORLD HEADQUARTERS Allen Bradley 1201 South Second Street Milwaukee WI 53204 USA Tel 414 382 2000 Telex 43 11 016 FAX 414 382 4444 PN 955117 58 Copyright 1994 Allen Bradley Company Inc Printed in USA
3. ALLEN BRADLEY wy Analog Block I O Module Cat No 1791 N4C2 Installation Mount the block I O module in a vertical recommended or horizontal position Allow sufficient room around the block for cooling air flow through the block module Refer to Figure 1 Figure 1 Mounting Dimensions for the Analog Block I O Module Cat No 1791 N4C2 4s x Inches Millimeters Block 695 660 176 5 167 6 2 0 50 8 air gap on all 4 sides Operating ten perature in air gap below module must not exceed 60 C 140 F Dimensions BRA 5065 6 95H x2 710W x 3 85D 176 5H x 68 8W x 98D Stud 2rrounting holes for 1 4 inch screws CAUTION When tightening grounding stud nut do not exceed 15 ibs Installation Instructions Block I O Cat No 1791 N4AC2 Figure 2 Mounting on a DIN Fail Block 1 Hook top of slot over DIN rail 2 While pressing block against rail pull down on locking lever 3 When block is flush against rail push up on locking lever to secure block to rail Labels for the front door and terrrinal strip are supplied with your module L Remove die cut labels from package 2 Remove plastic cover on terrrinal strip by flexing in midde Slip terrrinal designation label into built in holders in terrrinal strip cover Flex cover to install 3 Open clear front door Insert rrodule designation label into slots that secure it to t
4. e ee Rake7 1 1 1 Rak7o 1 1 2 o Rack address 77 is an illegal configuration PLC 5 11 processors can scan rack OB PLC 5 15 and PLC 5 20 processors can scan racks 01 03 PLC 5 25 and PLC 5 30 processors can scan racks 01 07 PLC 5 40 and PLC 5 40L processors can scan racks 01 17 PLC 5 60 and PLC 5 60L processors can scan racks 01 27 PLC 5 250 processors can scan racks 00 37 The SLC 500 controllers communicate with the block I O using an I O Scanner module cat no 1747 SN series A Refer to the user manual for the 1747 SN A Scanner module for more information Note This block I O module is not compatible with the 1747 DSN Distributed I O Scanner module Installation Instructions Block I O Cat No 1791 NM4C2 Termination Resistor A termination resistor must be installed on the last block in a series Connect the resistor as shown in Figure 8 Figure 8 Installing the Termination Resistor Connect terrrination resistor across terrrinals 6 BLU and 8 CLR 150 ohm 57 6K and 115 2K baud 82 ohm 230 4K baud 108351 ATTENTION Devices that are operating at 230 4K baud must have 82 ohm terminators in place for proper operation Indicators POWER COMM FAULT Indication Description Power OFF No power ON Power okay COMM OFF Communication not established ON Communication establis
5. he door 123851 Connect wiring as shown in Figure 4 Figure 5 or Figure 6 Installation Instructions Block I O Cat No 1791 N4AC2 Figure 4 Wiring Connections for the Analog Block Module with Voltage Input refer to Table A Analog signals must be within the LOV corrron rrode voltage range which is referenced to the analog Systermncorrron GND If an input channel floats outside of this range invalid input readings will result Installation Instructions Block I O Cat No 1791 462 Figure 5 Wiring Connections for the Analog Block Module with Current Input and Customer Supplied Loop Power refer to Table A Analog signals rrust be within the HOV corrrron node voltage range which is referenced to the analog systemcontron GND If an input channel floats outside of this range invalid input readings will result User 424v User GND ATTENTION The 249 ohm input current shunt is rated at 0 25 Watts Do not exceed this rating Installation Instructions Block I O Cat No 1791 N4AC2 Figure 6 Wiring Connections for the Analog Block Module with Current Input and Block Supplied Loop Power refer to Table A Analog signals rrust be within the HOV corrrron node voltage range which is referenced to the analog systemcomron GND If an input channel floats outside of this range invalid input readings will result Output 424V loop power supplied fromtenvinal 25 on block
6. hed Flashing Reset conmands being received in Programrrode FAULT OFF Normal ON Error hardwere or software block power low Flashing COMM FAIL rerrote I O wire disconnected 100rrs between valid franres no nore than 255 valid frarres between valid frames addressed to block 20rrs idle tine exceeded COMM and FAULT will altemately flash when processor restart lockout is selected a fault has occurred and the processor is communicating with the block 10 1791 NAC2 Specifications Input Specifications Installation Instructions Block I O Cat No 1791 N4AC2 Type of Input HOV 14 bit 35V 14 bit 0 10V 14 bit O 5V 14 bit 0 20 14 bit 20mA 14 bit Update Rate per Channel 1087s Input Impedance Absolute Accuracy Linearity Corrrron Mode Rejection Norrral Mode Rejection Output Specifications Outputs per Block Output Current Range Output Inqpedance Intemal Update Rate per Channel Drive Capability Short Circuit Protection Absolute Accuracy Linearity Overall Accuracy Drift Voltage 1 rregohm Current 249 ohm 0 1 25 C O 20m4 13 bits Greater than 1 rregohm 1 into loads of 1K ohms or less Indefinite 0 1 25 C 0 05 25 C over 4 20 range 75 ppmf c Specifications continued on next page 1 Installation Instructions Block I O Cat No 1791 N4C2 ALLEN BRADLEY A ROCKWELL INTERNATIONAL COMPANY XL With offices in
7. ted 20 28V d norrinal 24V voltage source for accommodating loop powered current transducer inputs Terrrirals 12 16 20 and 24 are internally connected together Tenrvinals 26 and 28 are internally connected together A UN H Table B Acceptable Wiring Cables for Block O Connection Use Cable Type Rerrote I O link Belden 9463 Input and output wiring Up to 14AWG 2rmff stranded with 3 64 inch insulation Installation Instructions Block I O Cat No 1791 N4C2 amp i Default Switch E Communication Rate Position O Position 1 Sw2 2 Sw2 1 Bits s 57 6K End View of Switch 1 m5 2K 1 2304 ATTENTION Cycle power to the module 1 1 2304K Starting Quarter Installation Instructions Block I O Cat No 1791 N4C2 SW1 Switch Position Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 3 o o ue N 8 o o ojo o BSEEBBEBB sse alea s e Rack 10 o Rack 11 Rack 11 Rack 11 o H Rack 12 Rack 12 Rack 12 H o FEEFEE BB RE Rack 13 Rack 13 Rack 13 pee oen ee 8 DT Popo EE H Installation Instructions Block I O Cat No 1791 N4AC2 SW1 Switch Position I o o o o 8 Bod ojojo ef e P CIHESESESESES Rake 1 2 ees Rakes 1 2 ola
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