Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual - Manual (Page 61)

Publication 1746-UM005B-EN-P - June 2004
Testing Your Module 5-7
device, properly configured, and must have no rungs in its ladder
program. The analog module LED must be illuminated.
The devices connected directly to the analog module outputs are
referred to as “actuators.” If the actuators do not affect prime movers
or initiate any other potentially dangerous operation, use these
devices to test the outputs.
If the actuators affect prime movers or initiate a potentially dangerous
operation, use a voltmeter to test the voltage outputs and an ammeter
to test the current outputs. Note that these meters have some inherent
error of their own.
In the latter case, disconnect actuators at the analog module outputs
to test the terminal blocks.
The following procedure applies to either of the previous situations.
1. Determine the boundary conditions for the analog module
output channel. For example, if the output channel is connected
to an actuator that has an input range of 1 volt to 5 volts, the
boundary conditions are 1 volt (lower) and 5 volts (upper).
2. Using the formulas from page, calculate the output decimal
values that must be entered into the processor image table to
produce the analog module output channel boundary conditions
determined in step 1.
For example, if 1 volt and 5 volts are boundary conditions, the
decimal values would be 3277 and 16384.
ATTENTION
The procedure described in this section for testing
analog module output channels assumes that all I/O
module outputs that normally activate prime movers
or other potentially dangerous devices have been
disconnected from these devices.
Do not attempt to test the analog module output
channels unless prime movers and/or other
potentially dangerous devices are disconnected from
the I/O modules.