POL688.10/STD | Siemens Programmable Controllers
Manufacturer: Siemens
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Part Number: S55396-C881-A100
Condition：New with Original Package
Product Type: Programmable HVAC Controllers
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Siemens POL688.10/STD Climatix C600 Programmable HVAC&R Controller
The Siemens POL688.10/STD, also cataloged as the S55396-C881-A100 Programmable HVAC&R Controller, operates as a dedicated hardware component for direct physical I/O execution, process monitoring, and multi-protocol data conversion within Climatix C600 building automation networks. Powered by a 24 VAC/DC auxiliary supply, this unit processes field signals across 27 built-in I/O channels comprising 3 universal inputs (UI), 8 universal I/O channels (UIO), 6 digital inputs (DI), 8 relay outputs, and 2 triac outputs. It streams runtime telemetry and control commands over integrated Ethernet, RS-485, and KNX interfaces using Modbus, BACnet, PL-Link, JSON, and OPC UA protocols.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | POL688.10/STD (Stock Number: S55396-C881-A100) |
| Brand | Siemens |
| Origin | Switzerland |
| Weight | 1.54 kg |
| Dimensions | 14.10 x 18.70 x 10.10 cm (packaging dimensions) |
| Operating Temp | -20 deg C to +60 deg C |
| Power Consumption | 24 VAC/DC |
| Product Series | Climatix C600 Series |
| Total I/O Points | 27 channels (3 UI, 8 UIO, 6 DI, 8 Relay DO, 2 Triac DO) |
| Communication Protocols | BACnet IP/MSTP, Modbus RTU/TCP, PL-Link, JSON, OPC UA, KNX |
| Hardware Interfaces | Ethernet RJ45, RS-485, USB interface, SD card slot |
| Real-Time Clock Backup | Integrated RTC (approx. 3 days without battery; up to 4 years with CR2032 battery) |
| Mounting | Control cabinet / DIN-rail system installation |
Firmware Flash Compatibility
The Siemens POL688.10/STD controller utilizes non-volatile flash memory architecture to maintain operating system routines, application logic algorithms, and fieldbus communication stacks. Firmware updates and application program transfers execute directly via the onboard USB host interface, external SD card slot, or remote Ethernet access points. System flash management maintains hardware configuration files and protocol definitions across power cycles, ensuring deterministic backplane communication velocity and uninterrupted I/O scan cycles after field power restoration.
Frequently Asked Questions
Q: How does the integrated RTC maintain time synchronization during auxiliary power loss?
A: The onboard Real-Time Clock relies on internal capacitive buffering to sustain clock operation for approximately 3 days without primary power. Installing a standard auxiliary backup battery extends real-time clock retention up to approximately 4 years.
Q: What physical limitations apply when wiring universal I/O (UIO) channels for analog feedback?
A: Universal I/O channels configured for active sensor measurements require dedicated signal reference ground return paths. Cabling for 0-10 VDC or 4-20 mA analog inputs must use shielded twisted-pair conductors to prevent electromagnetic interference from surrounding 24 VAC relay lines.
Q: How are configuration backups and trend logs extracted from the controller without a network connection?
A: Field engineers can insert an SD card into the dedicated SD slot or connect a USB flash device to upload system parameters, firmware binaries, and historical trend files stored within the internal memory partition.
Field Installation Guidelines
Mount the controller inside an IP20-rated enclosure on a standard 35 mm DIN rail, securing adequate clearance for heat dissipation and cable routing. Connect 24 VAC/DC power conductors to designated power terminals after verifying correct polarity and transformer isolation. Route low-voltage analog signal lines (UI, UIO) separately from mains AC control wiring and relay output contacts to suppress electrical noise coupling. Ensure cable shields terminate at the main panel grounding bus using short, heavy-gauge earth straps prior to commissioning.