Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual - Manual (Page 72)

Publication 1746-UM009B-EN-P - September 2007
72 Test Module Operation
Test Analog Outputs
Before testing the module’s output channels, the SLC 500 system must
be installed and tested according to the SLC 500 Modular Hardware
Style User Manual, publication 1747-UM011. The processor must be
connected to a programming device, properly configured, and must
have no rungs in its ladder program. The module’s LED indicator must
also be illuminated.
If the output device controls a potentially dangerous operation or a
prime mover, use a voltmeter to test voltage outputs or an ammeter to
test current outputs. Note that these meters have some inherent error
of their own.
If using a meter, disconnect the output device and/or use a substitute
load.
1. Determine the lower and upper limits of the module’s output
channel.
For example, if connected to a signal amplifier with an input
range of 1…5 volts, the signal limits are 1 volt (lower) and 5
volts (upper).
2. Compute the decimal value that should appear in the
processor’s output image table for the channel’s lower and
upper signal limits.
For example, limits of 1 and 5 volts would have decimal values
of 3277 and 16384, respectively. If you need help, refer to the
section, Converting Analog Output Data, in chapter 4.
3. With the programming device on-line, select Program mode.
4. Create and save the test rung shown below.
ATTENTION
Do not attempt to test the module’s output channels unless its
process control output devices have been disconnected,
inhibited, or replaced by a passive load.
MOV
MOVE
Source
Dest
N7:0
O:e.0-1
e is the module’s I/O rack slot number
0-1 is the number of the module’s output channel being tested