Rockwell Automation T7480 ICS Regent+Plus Guarded Analog Output Modules - Manual (Page 23)

Guarded Analog Output Modules (T7480)
P D - 7 0 2 6 M a r - 0 6
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4. Connect the six termination resistors to the I/O extender
jumper posts as shown in Figure 11. Use test clips as
required to make the connections.
5. Remove the four screws on one side of the module and
remove the printed circuit board from the module
clamshell housing.
6. With the printed circuit board removed from the system,
check the forward voltage drop (in-circuit) on all 12 output
diodes with a digital multimeter in the diode test mode (2
mA current source). Verify that the forward voltage drop
is within the following tolerances:
0.6 to 0.8 volts for CR100, CR200, CR300, CR400, CR500,
and CR600.
0.2 to 0.45 volts for CR101, CR201, CR301, CR401. CR501
and CR601.
7. Check the resistance (in-circuit) of the 12 output diodes
reversely polarized with a digital multimeter set to 20
MOhm resistance range, by connecting the (+) lead of the
meter to the cathode and the (-) lead of the meter to the
anode of the diode. Verify that the resistance is within the
following tolerances:
> 20 MOhm for CR100, CR200, CR300, CR400, CR500,
and CR600.
> 1 MOhm for CR101, CR201, CR301, CR401. CR501 and
CR601.
8. If any of the tests in steps 6 or 7 fails, the board should be
returned to the factory for repair or replacement. If the
tests passed continue to step 9.
9. Install the printed circuit board into the I/O extender
module. Perform a voted reset (press two of the processor
module Reset buttons) and verify that the module is Active
(green Active LED is on and red Fault LED is off). Allow
the board to warm up for approximately one minute.
10. Connect a 47K Ohm, 5% resistor between TP4 (AGND) and
the top lead of the first resistor (10K Ohm) on the SIP
resistor network RN101 (Figure 12 shows the exact
location of this resistor). Verify that the module signals a