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Honeywell FC-BN-1608 Digital Converter Module for NAMUR Signals

Configured for NAMUR signal conversion in Honeywell Safety Manager I/O systems, the Honeywell FS-BN-1608 (BN-1608 Digital Converter Module) provides direct electrical conversion of 16 channel discrete input signals from field devices.

Hardware Specifications

Parameter	Specification
Model	FC-BN-1608
Brand	Honeywell
Product Type	Digital Converter Modules
Function	NAMUR signal input conversion module
Input Channels	16
Input Type	DIN NAMUR compatible
Input Current Range	0-8 mA
Switch Level	1.4-1.9 mA
Hysteresis	0.2 mA +/- 0.05 mA
Input Resistance	1 kOhm 1%
Absolute Maximum Input Current	20 mA
Input Filter	First order low pass, 100 Hz
Field Wire Resistance	Maximum 50 Ohm
Cable Capacitance	Less than 16 uF total connected cables
8 V Loop Supply Output Voltage	7.9-8.7 V
8 V Loop Supply Output Current	170 mA, short-circuit proof
Maximum Load Capacitance	100 nF
Earth Resistor Resistance	100 kOhm 1%
Maximum Dissipation	0.6 W
Approvals	CE, TUV, UL, CSA, FM
Dimensions	58.5 x 28.5 x 9 mm (2.3 x 1.125 x 0.35 in)
Origin	USA

Process Signal Interface and Channel Isolation

The FC-BN-1608 module converts NAMUR type discrete field signals into internal digital input information for Honeywell Safety Manager architectures. The module accepts 16 independent input channels and monitors current switching levels according to DIN NAMUR requirements.

The input circuit uses a 1 kOhm resistance path and supports 0-8 mA signal measurement. Furthermore, the integrated 8 V loop supply provides field device excitation with short-circuit protection. The design supports field wiring supervision through defined current thresholds and hysteresis characteristics.

Honeywell process control modules commonly integrate channel-to-channel isolation methods within I/O architectures. For this module, field signal processing focuses on stable current detection and controlled NAMUR switching recognition rather than analog measurement conversion.

Frequently Asked Questions

Q: Does the BN-1608 require an external power supply?
A: No. The module does not require separate power input. It operates through the Honeywell I/O backplane connection and provides an 8 V loop supply for connected field devices.

Q: How many NAMUR input devices can the BN-1608 connect simultaneously?
A: The BN-1608 supports 16 NAMUR input channels. Each channel processes one DIN NAMUR compatible discrete signal.

Q: Can the BN-1608 handle field wiring capacitance?
A: Yes. The module supports a total connected cable capacitance below 16 uF and accepts field wire resistance up to 50 Ohm.

Field Installation Guidelines

Install the BN-1608 module directly on the designated programming connector of the Honeywell I/O backplane. No additional chassis mounting space is required.

Connect NAMUR field devices according to the specified input wiring arrangement. Keep field signal cables separated from high voltage power cables to reduce electromagnetic interference.

Use proper cable shielding and terminate shields according to the system grounding design. Verify the loop supply voltage and field wiring resistance before commissioning.

Confirm that connected devices match DIN NAMUR current switching characteristics. Check input current levels during startup to ensure correct channel recognition.

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