Siemens PXC Modular Series User Manual

Service Information
Troubleshooting Compact Field Panels
92
| 100
Siemens Industry, Inc.
Technical Reference Manual
145-172
Building Technologies
Restricted
2018-09-25
RUN LED
The RUN LED is on solid.
 The RUN LED is steadily lit during normal operation to indicate that 24 Vac power
is ON and the application firmware has booted.
The RUN LED is ON. No communication is possible with the HMI port.
1. Verify that HMI port and your terminal are set to the same communication speed.
– The factory-default communication speed of the PXC-16 and PXC-24 HMI port
is 9600 bps.
– The factory-default communication speed of the PXC-36 HMI port is 115.2
Kbps.
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).
TX and RX LEDs
The TX and RX LEDs are off or on solid. No communication over the
ALN trunk.
1. Verify that the ALN trunk is securely connected to the ALN port on the Field Panel.
2. On a two-wire ALN trunk, verify that the shield is connected to the enclosure
ground and not the S-pin (may also be marked as a reference pin [add image
here]).
3. Verify the field panel address and communication speed.
4. Verify that the extended ALN trunk is operating.

Siemens PXC Modular Series Specifications

General

Brand	Siemens
Model	PXC Modular Series
Category	Control Unit
Language	English