1746-NO4I SLC 500 Analog Output Module

The Allen-Bradley 1746-NO4I module is a Programmable Logic Controller (PLC) analog output

module that belongs to the SLC 500 product platform. This module is used with the mentioned

platform and compatible with the Two (2) controller variant such as fixed hardware of modular hardware style.

This module is capable of producing an output Current range of 0 to 20 mA that may be used to drive

modulating instruments and devices. Typical analog outputs are connected to a controller’s control

command. If used with a Proportional-Integral-Derivative controller, the analog output is assigned to

represent the Control Output (CO) of the PID controller. For manual loading stations, the analog output

represents the manual command entered by the operator. It may also be used to re-transmit an important

signal to a single or multiple device. This may be for the purposes of indication, data logging and signal conversion.

1746-NO4I

The appropriate signal is assigned by modifying the module properties. This module is also installed

with an embedded selector switch to allow selection of power supply source. Internal power supply may

be selected which means that the module will utilize the supply from the backplane while external

source refers to an external power supply with specification of 24 ±10% at 195 mA max.

The Allen-Bradley 1746-NO4I is an SLC 500 Four (4) channel analog output module using a

16-bit 2’s complementary binary format. It has 4 current outputs that have an output range of 0

to +20 mA with full-scale current output of 21 mA. The backplane current draw of this module is

55 mA at 5 VDC while and 195 mA at 24 VDC while the over range capacity is 5% (0 to 21 mA

and 1 LSB). Its power supply voltage rating is 24 Volts DC +/- 10% at 195 mA maximum and the

backplane isolation is 500 Volts DC. Note that some applications require 21.6 to 26.4 Volts

DC power when there is not enough power flowing from the SLC power supply.