Rockwell Automation 57C409 2 Channel Analog Input Module - Manual (Page 16)

3Ć4
These can easily be compensated for in software. Perform
the following steps to determine the compensation values:
Set the analog input voltage to 0 volts. Use the I/O
MONITOR to read the digital value. This is the offset.
Set the analog input voltage to maximum. Use the I/O
MONITOR to read the digital value. Subtract the offset
calculated in the previous step from this number. The
result is the gain.
Use the following equation in your application program to
compensate the data:
CORRECTED VALUE%=(RAW DATA% Ć OFFSET%) * 4095/GAIN%
3.3 Module Replacement
Use the following procedure to replace a module:
Step 1.
Turn off power to the rack and all connections.
Step 2. Use a screwdriver to loosen the screws holding the
connector to the module. Remove the connector.
Step 3. Loosen the screws that hold the module in the rack.
Remove the module from the slot in the rack.
Step 4. Place the module in the antiĆstatic bag it came in, being
careful not to touch the connectors on the back of the
module. Place the module in the cardboard shipping
container.
Step 5. Take the new module out of the antiĆstatic bag, being
careful not to touch the connectors on the back of the
module.
Step 6. Insert the module into the desired slot in the local rack.
Use a screwdriver to secure the module into the slot.
Step 7. Attach the field terminal connector (M/N 57C371) to the
mating half on the module. Make certain that the
connector keys are oriented correctly and that the
connector is the proper one for this module. Use a
screwdriver to secure the connector to the module.
Step 8. Turn on power to the rack.