Siemens PXC5.E24.A

Compatibility

Compatible with EpiSensor Edge over BACnet/IP

Edge’s BACnet/IP client reads the controller’s commissioned objects over its Ethernet interface. Siemens documents BACnet/IP over UDP/IP, and the current PICS lists ReadProperty and ReadPropertyMultiple; the live Device object and Object_List give the starting inventory. BACnet/SC and BACnet MS/TP are not Edge routes.

PXC5.E24.A S55375-C120, with reference manual A6V12954388_en--_e and the April 2026 PICS. Site check: confirm the commissioned system runs BACnet/IP rather than BACnet/SC only, then compare one selected reading with Desigo. Keep the external client read-only; no PPCL, schedule, priority or output changes.

Connect it with

• Gateway ZGW-20 From €899 ex VAT Configure
• Evaluation Gateway on a Raspberry Pi Edge with one device licensed Free Set up

Models

Specifications

Siemens identifies PXC5.E24.A S55375-C120 as a compact 24-point automation station with BACnet/IP and BACnet/SC, system-management functions and up to six TX-I/O modules.¹

Exact hardware

PXC5.E24.A, order number S55375-C120¹

Onboard and expansion I/O

24 onboard points: 2 DI, 8 UIO, 8 XIO and 6 relay outputs; up to 120 points with six TX-I/O modules¹

Ethernet BACnet

BACnet/IP over UDP/IP and BACnet/SC over WSS and HTTPS with TLS 1.3²

Field-level interfaces

Two EIA-485 ports configurable for Siemens P1, BACnet MS/TP or Modbus RTU²

BACnet profile evidence

Current PICS includes ReadProperty and ReadPropertyMultiple services and standard analog and binary input and value object types³

Monitoring starting point

Read Device identity, discover Object_List and inspect per-point value, unit and quality properties^{3, 4, 5, 6}

Interface

Documented measurements and integration boundaries for PXC5.E24.A.

• Potential temperatures, pressures, flows, equipment states and energy values can appear as project-defined BACnet input or value objects.
• For each approved object retain device and object identifiers, object type, name, description, engineering unit, source, update behavior and reliability or status information.
• A value integrated from Modbus RTU or BACnet MS/TP must retain its original field-device identity, scale, unit and communications status.
• Commandable values, priority-array writes, schedules, alarm acknowledgements, PPCL logic, parameters and physical outputs remain outside this guide.

Setup

1. Confirm the exact controller and project

   Record PXC5.E24.A S55375-C120, serial number, firmware, DT+ and ABT Site versions, project backup, device instance and current PICS. Do not substitute the no-WLAN or earlier PXC5.E24 hardware.

2. Identify the active BACnet transport

   Confirm whether the commissioned system uses BACnet/IP, BACnet/SC or BACnet MS/TP. Edge reads BACnet/IP. BACnet/SC and MS/TP are separate transports; do not switch a BACnet/SC system to BACnet/IP without the controls owner’s approval.

3. Discover identity and the installed point list

   On the commissioned BACnet/IP subnet, use Who-Is/I-Am discovery and record the returned Device instance and address. Read Model_Name, Firmware_Revision, Application_Software_Version and Protocol_Revision from that Device object. Read Object_List to obtain actual object identifiers, then select by Object_Name and Description. Retain the selected type, instance, unit and source; the order code does not assign site point instances. Keep the existing routed-network arrangement and use its approved discovery path.

4. Read one measurement and its quality

   Select an Analog Input and read Present_Value, Units, Status_Flags, Reliability and Out_Of_Service. Siemens defines Present_Value in engineering units: a synthetic 23.4 with degrees-celsius means 23.4 °C, not a raw Modbus register needing another scale. Compare it with Desigo and the source sensor. Out_Of_Service decouples the value from the physical input; the proprietary Tracking_Value retains the measured input for diagnosis where exposed. Keep timestamps and mark timeouts as stale, not zero. Use ReadPropertyMultiple for small batches where supported, reducing reply size to the Device APDU and segmentation limits. Issue no WriteProperty request.

Common questions

Does Edge use BACnet/SC on PXC5.E24.A?

No. Edge reads the controller over BACnet/IP, which the same Ethernet interface supports. BACnet/SC is a separate transport with its own certificates and trust configuration, and it must not be treated as BACnet/IP.^2, 3

Can an external client read every configured point?

The installed application determines the point list. Read Object_List from the Device object, then inspect names, units and quality for the measurements needed. A project export can help identify sources but is not the only starting point. Read access follows the site’s network policy; writable properties can be observed without commanding them.^{1, 3, 4, 5, 6}

Can this guide write setpoints or outputs?

No. The PICS includes write services, but this guide releases no WriteProperty operation, priority-array change, schedule edit, alarm acknowledgement, parameter change or physical output command.³