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Honeywell FC-BKM-0001 Battery and Key Switch Module

The Honeywell FC-BKM-0001, also cataloged as the FC-BKM-001 Battery and Key Switch Module, operates as a dedicated hardware component for memory backup and maintenance control execution within Honeywell Safety Manager and Fail Safe Control (FSC) controller chassis.

Hardware Specifications

Parameter	Specification
Model	FC-BKM-0001 / FC-BKM-001
Brand	Honeywell
Product Type	Battery and Key Switch Module
System Platform	Honeywell Safety Manager / Fail Safe Control (FSC)
Origin	USA
Weight	Approx. 0.5 kg to 0.66 kg
Dimensions	176 x 35.2 x 224 mm
Operating Temp	-5 deg C to +70 deg C
Storage Temp	-40 deg C to +85 deg C
Relative Humidity	10% to 95% non-condensing
Power Consumption	24 VDC supply: typical 7 mA, maximum 20 mA; 5 VDC supply: maximum 10 mA
24 V Supply Voltage	24 VDC with -15% to +30% tolerance
5 V Supply Voltage	5 VDC +/- 10%
Output Voltage (+24V_red)	14 VDC to 31 VDC, short-circuit proof
Battery Type	SAFT LS14500CFG lithium thionyl chloride battery
Battery Quantity	2 units, one battery for each Control Processor
Battery Voltage	3.6 V per battery
Battery Capacity	Greater than 2.0 Ah
Digital Inputs	3 x 24 VDC general-purpose inputs
Certifications	CE, TUV, UL, CSA, FM

Channel Isolation and Safety Control Interface

The FC-BKM-0001 provides electrical interfaces for controller memory retention and physical maintenance authorization functions. It integrates two independent lithium batteries to support CP1 and CP2 memory backup during loss of the primary power source. In addition, the module provides key-operated control paths for reset functions and force enable operations.

Furthermore, the module design follows Honeywell Safety Manager FSC hardware architecture requirements. The battery circuits maintain stored controller data, while the key switch inputs provide controlled operator access for maintenance procedures. The three 24 VDC general-purpose inputs allow auxiliary status monitoring within the safety controller chassis.

Frequently Asked Questions

Q: Does the FC-BKM-0001 provide independent battery backup for redundant processors?
A: Yes. The module contains two lithium batteries, with each battery assigned to one Control Processor to maintain memory retention functions.

Q: What maintenance functions are controlled by the key switches?
A: The module provides physical key switch control for controller reset operations and force enable authorization during maintenance activities.

Q: Can the FC-BKM-0001 operate without the installed batteries?
A: The module can receive external power without batteries installed, but memory retention during power interruption requires the battery units.

Field Installation Guidelines

1. Install the FC-BKM-0001 inside the designated Honeywell Safety Manager or FSC controller chassis slot according to the system hardware configuration.
2. Verify that the controller power supply is isolated before module insertion or removal. Follow approved shutdown procedures before accessing the chassis.
3. Confirm correct battery polarity before installation. Avoid short-circuiting lithium battery terminals during handling.
4. Route 24 VDC wiring separately from high-voltage power cables and high-current switching circuits to reduce electrical interference.
5. Connect grounding and shielding according to the controller cabinet installation standard. Maintain proper cabinet bonding for signal integrity.
6. Inspect key switch mechanical operation before commissioning. Verify that reset and force enable functions respond correctly through the controller diagnostic interface.

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