Operating Instructions

Chapter 4—Troubleshooting
Troubleshooting Compact Field Panels
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Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
2. Verify that the cable from the field panel to the operator's terminal is properly
connected at both ends.
3. Open the enclosure and verify that both ends of the HMI extension cable are
properly connected.
4. Unplug the extension cable and plug directly into HMI port.
The RUN LED is off.
1. Verify that power is connected.
2. Check the service box and transformer ON switches.
3. If power is ON, verify that the application firmware has booted.
4. Measure voltage on 24V~ and (Terminals 1 and 2).
Communication
Points cannot be read or commanded from the operator's terminal.
1. Verify that failed points have been properly addressed.
2. Verify the status of the points at the operator's terminal. Verify that points are not
under Operator priority.
Communication issues begin after a field panel is installed.
1. If the new field panel is installed on an ALN with two-wire shielded twisted pair
cable, verify that the Shield conductor is connected to the earth ground.
2. Verify that the S-pin (may also be marked with a reference pin [add image here]) is
not connected to the cable shield or earth ground.
3. Ensure the power plug ground terminal is connected to an earth ground.
4. Verify that the network cable shield is connected to the earth ground connection on
one end only.
No communication over the FLN trunk.
1. Verify the FLN address and communication speed.
2. Verify the FLN trunk is connected to the correct FLN port.
Display
NOTE:
In BACnet/IP or Ethernet TCP/IP (P2) ALN mode, RS-485 parameters are displayed
and may be entered as a selection. However, when in RS-485 ALN mode, BACnet/IP
or Ethernet TCP/IP (P2) ALN parameters are not an available selection.