Allen-Bradley SLC 500 ™ Installation Guide for 32 Channel Digital I/O Module

Allen-Bradley SLC 500 ™  Installation Guide for 32 Channel Digital I/O Module

Product scope of application and requirements for hazardous environments

（1） Applicable scenarios

Environmental classification: Only applicable to Class I, Division 2 hazardous environments (Groups A, B, C, D) or non hazardous environments, prohibited for use in higher-level hazardous areas (such as Class I, Division 1).

Core restriction: Live replacement of components or wiring is prohibited in hazardous environments. Component replacement must use original factory accessories, otherwise it may damage the explosion-proof characteristics.

（2） Multi language support

The document contains bilingual hazardous environment warnings in English and French, with the French version emphasizing component replacement risks and power outage operation requirements, adapting to the compliance needs of the European market.

Module overview and installation process

（1） Module positioning

The 1746 series 32 channel digital I/O module is a dedicated module for SLC 500 chassis, which is divided into input modules (IB32, IV32) and output modules (OB32, OB32E, OV32). Its core function is to achieve bidirectional interaction between industrial field digital signals (such as sensors and actuators) and PLC, supporting 24V DC mainstream industrial voltage. It is designed according to "group isolation" (input 4 groups/8 points, output 2 groups/16 points) to reduce signal interference.

（2） Standard installation steps (power-off operation)

Power off preparation: Disconnect the chassis power supply to ensure no voltage input.

Module alignment: Align the module circuit board with the chassis card slot to avoid touching the backplane pins (to prevent static damage).

Insertion fixation: Slowly push the module into the upper and lower self-locking tabs to tighten, without the need for additional screws.

Wiring arrangement: After wiring, comb down the wires and fix them in the module slot with cable ties to avoid blocking heat dissipation or loosening.

Idle slot handling: Cover the idle slots with 1746-N2 slot filling plates to prevent dust from entering the chassis.

（3） Module disassembly

First, disconnect the external wiring or pre wired connector, press the release tabs up and down on the module, and pull out the module horizontally. Do not forcefully pull or pull it.

Core technical specifications

（1） Input module specifications (IB32, IV32)

Specification category 1746-IB32 (24V DC sinking input) 1746-IV32 (24V DC sourcing input)

Number of channels: 32 channels, 32 channels

8 points per group/public end (4 groups in total, isolated between groups) 8 points per public end (4 groups in total, isolated between groups)

Working voltage 15-30V DC (50 ℃), 15-26.4V DC (60 ℃) 15-30V DC (50 ℃), 15-26.4V DC (60 ℃)

Backplane current consumption 5V DC 0.050A, 24V DC 0A, 5V DC 0.050A, 24V DC 0A

Backboard isolation voltage 1500V AC (1 minute) 1500V AC (1 minute)

Signal delay (maximum) 3ms for both on/off and 3ms for both on/off

Conducting voltage (minimum) 15.0V DC 15.0V DC

Turn off voltage (maximum) 5.0V DC 5.0V DC

Turn off current (maximum) 1.5mA 1.5mA

24V DC nominal input current 5.1mA 5.1mA

Total heat dissipation power 6.65W (0.20W per point, minimum 0.25W) Total 6.65W (0.20W per point, minimum 0.25W)

Fuse protection (Series A/B/C) with 1 non replaceable 2.5A fuse per group, Series D without 1 non replaceable 2.5A fuse per group, Series D without

（2） Output module specifications (OB32, OB32E, OV32)

Specification category 1746-OB32 (Series D, 24V DC sourcing output) 1746-OB32E (24V DC sourcing with electronic protection) 1746-OV32 (Series D, 24V DC sinking output)

Number of channels: 32 channels, 32 channels, 32 channels

16 points per group/common end (2 groups in total, isolated between groups) 16 points per common end (2 groups in total, isolated between groups) 16 points per common end (2 groups in total, isolated between groups)

Working voltage 5-50V DC 10-30V DC 5-50V DC

Backplane current consumption 5V DC 0.190A, 24V DC 0A 5V DC 0.190A, 24V DC 0A 5V DC 0.190A, 24V DC 0A

Backboard isolation voltage 1500V AC (1 minute) 1500V AC (1 minute) 1500V AC (1 minute)

Signal delay (maximum) conducts 0.1ms, turns off 1.0ms conducts 0.1ms, turns off 1.0ms conducts 1.0ms, turns off 2.0ms

Turn off leakage current (maximum) 1mA 1mA 1mA 1mA

Minimum load current 1mA 1mA 1mA

Module total continuous current (maximum) 8.0A (0-60 ℃) 8.0A (0-60 ℃) 8.0A (0-60 ℃)

Single channel continuous current (maximum) 0.50A at 30 ℃, 0.25A at 60 ℃, 0.50A at 30 ℃, 0.25A at 60 ℃, 0.50A at 30 ℃, and 0.25A at 60 ℃

Continuous current per group (maximum) 4.0A (0-60 ℃) 4.0A (0-60 ℃) 4.0A (0-60 ℃)

Continuous current per pin (maximum) 2.0A (0-60 ℃) 2.0A (0-60 ℃) 2.0A (0-60 ℃) 2.0A (0-60 ℃)

Voltage drop during conduction (maximum) 1.2V (at 0.5A) 1.2V (at 0.5A) 1.2V (at 0.5A)

Surge current (per point) 1.0A/10ms at 30 ℃ (once per second), 1.0A/10ms at 60 ℃ (once every 2 seconds), 1.0A/10ms at 30 ℃ (once per second), 1.0A/10ms at 60 ℃ (once every 2 seconds), 1.0A/10ms at 30 ℃ (once per second), 1.0A/10ms at 60 ℃ (once every 2 seconds)

Electronic protection None (short circuit, overload thermal cut-off protection) None