Siemens XDLC (S54430-B8-A1) — Class X device loop card that connects Siemens addressable intelligent X-series and H-series devices to a Desigo Fire Safety Modular panel, supporting up to 252 addressable points on one network address.
The XDLC initializes, operates and maintains every device on up to four Class A or eight Class B addressable circuits, communicating alarm, trouble and supervisory data to the panel while supervising the device loop itself. Those 252 points can be any combination of detectors, devices, relay and audible bases, remote lamps and duct-detector housings. The card is polarity insensitive in non-isolation mode via SureWire technology, which removes most of the commissioning time normally lost to tracing crossed field wiring, and it supports T-tapping. An on-board microprocessor controls the isolators so that a short on one circuit does not take down the others, and that microprocessor keeps running even if the panel CPU fails — the degrade-mode behaviour that makes Class X survivability meaningful. Sixteen diagnostic LEDs make circuit faults readable at the card, and ground-fault detection and zone-isolation circuitry are built in. The card plugs into one slot of a CC-2 or CC-5 card cage and is configured with the Zeus-D tool.
Specifications
| Part number |
S54430-B8-A1 |
| Capacity |
Up to 252 addressable detectors and devices; takes one address on the network |
| Circuits supported |
Up to four Class A or eight Class B addressable circuits |
| Wiring styles |
Class B, Class A and Class X; T-tapping supported |
| Device loop output |
500 mA max. @ 30 VDC max., power limited |
| 24V current draw (screw terminal) |
100 mA + 1.4 mA per device |
| 24V current draw (standby) |
100 mA + 1.4 mA per device |
| 6.2V current draw (backplane) |
1 mA maximum |
| Diagnostics |
16 LEDs; ground-fault detection and zone-isolation circuitry |
| Mounting |
One slot of a Model CC-2 or CC-5 card cage |
| Configuration tool |
Zeus-D, the Desigo Fire Safety Modular custom-configuration tool |
| Operating environment |
Indoor dry locations, 32±3°F to 120±3°F (0±2°C to 49±2°C); relative humidity 93±2% at 90±3°F (32±2°C) |
| Listings |
UL 864 and CAN/ULC Listed |
Installation notes
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Size the loop by current, not just by count: the device loop is limited to 500 mA at 30 VDC, and standby draw is 100 mA plus 1.4 mA per device. A loop can reach the 252-point limit and still need checking against those figures.
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Polarity insensitivity is conditional: SureWire polarity insensitivity applies in non-isolation mode. Devices configured as isolators are polarity sensitive, so isolator wiring still has to be right.
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Check panel compatibility before ordering: the data sheet directs installers to installation manual P/N A6V101040156 to confirm XDLC compatibility with the specific Siemens FACP intended for the application.
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Card cage slot required: the XDLC occupies one slot in a CC-2 or CC-5 card cage; it is not a standalone module.
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Mixed device generations are supported: both the newer X-series and legacy H-series intelligent addressable devices can share the loop, which is what makes staged panel replacements possible without swapping every head.
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Isolation is on the card: a short on one circuit is isolated by the card's own microprocessor so the remaining circuits keep operating, and that processor continues to run through a CPU failure.
Related models
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DLC — the earlier FireFinder XLS intelligent device loop card, without Class X support
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MLC (S54431-B4-A1) — MXL addressable device line card, for the MXL platform rather than Desigo Modular
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DPU (500-033260) — device programmer and tester that addresses and verifies the devices this card will run, including duct detectors
Specifications taken from the Siemens data sheet "Desigo® Fire Safety Modular system Device Loop Card, Model XDLC," document 7312 (August 2018, Rev. 2). Manufacturer specifications are subject to change without notice.
