How to troubleshoot Siemens PXC Compact when analog input/output points are not reading as expected?
If the analog input/output points on your Siemens Control Unit aren't reading correctly, verify that all slope/intercept entries are correct. Also, ensure the sensor is functioning properly and replace it if necessary.
What to do if the RUN LED is off on Siemens Control Unit?
If the RUN LED is off on your Siemens Control Unit, first verify that power is connected. Then, check the service box and transformer ON switches. If power is ON, verify that the application firmware has booted. Finally, measure voltage on 24V~ and (Terminals 1 and 2).
How to fix Siemens PXC Compact Control Unit when points cannot be read or commanded from the operator's terminal?
If points cannot be read or commanded from the operator's terminal on your Siemens Control Unit, verify that any failed points have been properly addressed. Also, verify the status of the points at the operator's terminal and ensure that points are not under Operator priority.
What to do if the RUN LED is ON but no communication is possible with the HMI port on Siemens Control Unit?
If the RUN LED is ON but there's no communication with the HMI port on your Siemens Control Unit, verify that the HMI port and your terminal are set to the same communication speed. Also, ensure that the cable from the field panel to the operator's terminal is properly connected at both ends. Open the enclosure and verify that both ends of the HMI extension cable are properly connected. Try unplugging the extension cable and plugging directly into the HMI port.
Why is there no communication over the ALN trunk on Siemens Control Unit?
If there is no communication over the ALN trunk on your Siemens Control Unit, and the TX and RX LEDs are off or on solid, verify that the ALN trunk is securely connected to the ALN port on the Field Panel. On a two-wire ALN trunk, verify that the shield is connected to the enclosure ground and not the S-pin. Verify the field panel address and communication speed. Also, verify that the extended ALN trunk is operating.
How to troubleshoot Siemens Control Unit when LAI point does not function properly?
If an LAI point on your Siemens Control Unit isn't functioning correctly or shows as failed (*F*), verify that the field input device is within range. Also, make sure that points are properly terminated on the termination board or module. Confirm that the correct voltage is supplied to the device, as in a 4 to 20 mA device.
How to troubleshoot Siemens PXC Compact Control Unit when LAO point does not function properly?
If an LAO point on your Siemens Control Unit is not functioning properly, displays as failed (*F*), and the output doesn't change when commanded, verify that the device connected to the point is functioning properly and is not shorted out. Also, verify that points are properly terminated on the termination board or module. Finally, verify that the correct voltage is supplied to the device.
How do I fix no communication over the FLN trunk on Siemens PXC Compact?
If there is no communication over the FLN trunk on your Siemens Control Unit, verify the FLN address and communication speed. Also, verify the FLN trunk is connected to the correct FLN port.
Why does the BATT LOW LED remain on after battery replacement in Siemens Control Unit?
If the BATT LOW LED remains on after replacing the battery in your Siemens Control Unit, verify that the correct type of battery is being used. The LOW BATT LED remains ON if an alkaline battery is used in PXC Compact models with extended temperature range operation.
What to do if the battery low warning is displayed on Siemens PXC Compact Control Unit?
If the BATT LOW LED is on or the battery low warning is displayed at the operator's terminal of your Siemens Control Unit, check that the mylar insert was removed from the AA (LR6) battery holder. Check for correct polarity (+ to +) and (- to -). Check that the battery is properly seated in the battery holder. If needed, replace the battery.
General| Brand | Siemens |
|---|---|
| Model | PXC Compact Series |
| Category | Control Unit |
| Language | English |
General introduction to the PXC Compact Series controllers and their capabilities.
Details on integration with APOGEE automation systems and field panels.
Information on BACnet/IP, Ethernet TCP/IP (P2), and RS-485 protocol support.
Configuration options for analog and digital I/O points for PXC models.
Visual layout and terminal block connections for 16/24 and 36-point PXC Compact models.
Overview of PXC Compact hardware components, connectors, and features.
Details on 24 Vdc external sensor power source and shield termination.
Information on Flash ROM, RAM, and essential battery backup systems.
Management, replacement, and troubleshooting of AA and coin cell backup batteries.
Technical specifications for processor, memory size, and communication interfaces.
Details on power requirements, I/O capabilities, and operating conditions.
Information on HMI, Ethernet, RS-485, USB ports, and TX-I/O Island Bus.
Details on Field Level Network (FLN) support and P1 mode functionality.
Features and installation of Hand-Off-Auto (HOA) switches and upgrade kits.
Configuration and operation of PXC Compact controllers in P1 mode.
Overview, features, and operation of PXM10S/T operator display modules.
Introduction to the UEC controller and its FLN/ALN node operating modes.
Guidelines for performing maintenance, troubleshooting, and corrective measures.
Interpreting RUN, BATT LOW, TX/RX LED indicators and initial checks.
Troubleshooting network communication failures and display problems.
Diagnosing errors, module failures, and communication issues on the TX-I/O bus.
Steps for replacing TX-I/O plug-in modules and complete module assemblies.
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