Siemens MLC — MXL addressable device line card, part number S54431-B4-A1, supplying two intelligent analog circuits to a FireFinder XLS control panel.
The MLC is the loop driver that lets MXL-generation devices run on a Siemens modular panel. Detectors are polled for sensitivity and obscuration, and an on-board processor lets the card run in degrade mode and raise alarms even if the panel CPU fails.
- Two analog circuits, each supporting up to 60 alarm, trouble, supervisory and status devices
- Accepts Model I, ID, IL and FP series devices, plus CZM-1B6 zone modules and ICP-B6 control points
- Class B (Style 4) or Class A (Style 6) per circuit, with T-tap wiring on Class B
- Occupies two HNET addresses and one CC-5 or CC-2 card cage slot
- Ground-fault detection on board; isolation with the LIM-1 module
- UL 864 9th Edition certified and CSFM approved
The CZM-1B6, ICP-B6 and LIM-1 are field devices the MLC supervises, not alternative cards. Siemens documents this same part under two sheets, 6354 for FireFinder XLS and 7354 for Desigo Fire Safety Modular, so a Desigo Legacy Line Card listing is this card.
Documents
FAQ
Which panel does the MLC fit?
The MLC is an optional card for the FireFinder XLS. It plugs into one slot of a CC-5 or CC-2 card cage and uses two addresses on the HNET network.
How many devices does it support?
It has two intelligent analog circuits, each supporting up to 60 alarm, trouble, supervisory, security and status devices.
What happens if the panel CPU fails?
The card has its own microprocessor, so it can run in degrade mode and still start alarm conditions if the FireFinder XLS main CPU fails.
How can the circuits be wired?
Each circuit can be wired Class B (Style 4), with T-tap wiring allowed, or Class A (Style 6). The LIM-1 module adds short-circuit isolation.
