Field Interface Card Is Not Working - Honeywell CIU 888 Troubleshooting And Maintenance Manual

NOTE: Currently, no field repairs of the carrier board are possible
FIGURE 3-6
NOTE: All field interface cards have an auto-resettable fuse for the 16 Volts power
Part No.: 4417594_Rev11
Hardware Troubleshooting
Solution
Perform the following steps:
1. Check if the fixed port is indeed not working.
2. If possible, use a different port.

3.6 Field interface card is not working

Problem
A field interface card installed in the CIU 888 is not working (see
FIGURE 3-6).
CIU 888: Field interface cards
Solution
Perform the following steps:
1. If none of the field interface cards are working, start by disconnecting
fields cables from the CIU 888 and check if the remaining field
interface cards come back up after one minute.
2. If only one field interface card is not working, disconnect the asso-
ciated field cable from the CIU 888. Wait for one minute and retry.
3. Check the field interface card:
a) Remove the cover on top of the CIU 888.
b) Check the field interface card(s) for any signs of damage.
c) Check the voltages of the field interface cards.
supply. In addition, there is an overall resettable fuse on the 16 Volts line.
d) Replace a defective field interface card or have it replaced.
Troubleshooting & Maintenance Guide
CIU 888 3 - 5