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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Model | FC-SDIL-1608 |
| System | Safety Manager |
| Module Type | Safe line-monitored digital input |
| Special Function | Earth-fault monitoring |
| Number of Inputs | 16 |
| Input Type | DIN 19234 / NAMUR |
| Input Configuration | Loop-monitored loops or status signals |
| Switch Level | 1.4–1.9 mA |
| Hysteresis | 0.2 mA ± 0.05 mA |
| Input Filter | First-order low-pass, 100 Hz |
| Maximum Field Wire Resistance | 50 Ω |
| Loop Supply Output Voltage | 7.9–8.7 V |
| Loop Supply Output Current | 170 mA, short-circuit protected |
| Maximum Load Capacitance | 100 nF |
| 5 VDC Power Requirement | 160 mA |
| 24 VDC Power Requirement | 110 mA |
| Rack Space | 4 TE, 3 HE / 4 HP, 3U |
| Approvals | CE, TÜV, UL, CSA, FM |
| Construction | Conformal-coated FC version |
The input specifications above are from Honeywell’s Safety Manager Hardware Reference, where the SDIL-1608 specifications are stated in combination with the BN-1608.
Input Characteristics
The SDIL-1608 uses NAMUR-type digital input signaling rather than a generic 24 VDC digital input interface. Its documented switching threshold is 1.4–1.9 mA, with 0.2 mA ±0.05 mA hysteresis. The input filter is a first-order 100 Hz low-pass filter.
The module also provides an approximately 8 V loop supply, specified at 7.9–8.7 VDC and up to 170 mA, with short-circuit protection.
This makes the FC-SDIL-1608 materially different from a conventional PLC 24 V digital input card.
Product Introduction
The Honeywell FC-SDIL-1608 is a 16-channel safe digital input module used in Honeywell Safety Manager systems. Its primary function is to acquire discrete field signals while supporting line monitoring and earth-fault monitoring. Honeywell classifies the SDIL-1608 as a safe line-monitored digital input module with 16 channels.
The module is designed around DIN 19234 / NAMUR input characteristics. The documented switching level is 1.4–1.9 mA, rather than the 24 V threshold commonly associated with standard PLC digital inputs. This distinction matters when checking field-device compatibility, termination hardware, and loop wiring.
The FC designation identifies the conformal-coated version. Honeywell separately documents FS- and FA- type numbers, so the FC, FS, and FA versions should not be treated as interchangeable solely because they share the base designation.
The module occupies 4 TE × 3 HE, equivalent to 4 HP × 3U, and its power requirement is specified as 160 mA from 5 VDC or 110 mA from 24 VDC.
What the FC- Is Used For
Typical system functions include acquisition of discrete safety-related field states where line monitoring is required. The module can be used with compatible NAMUR-type field devices and associated Safety Manager termination hardware.
The line-monitoring function is important because the system is not simply determining whether a digital input is ON or OFF. The input circuit also provides diagnostic information associated with the field loop. This allows the Safety Manager architecture to distinguish operating states from certain wiring or field-loop faults when the complete approved circuit is configured correctly.
FC- Revision Control
Honeywell’s TÜV Safety Manager release record identifies the following FC- revisions:
- CC V1.0 — order number 3432104
- CC V1.1 — order number 3432107
- CC V1.2 — order number 3432109
- CC V1.3 — order number listed as “See CN”
All are identified in that certification record as valid Safety Manager configurations.
This is an important spare-parts consideration. A supplier listing that says only does not establish which hardware revision will actually be shipped.
Honeywell also published a 2019 system notification concerning revisions V1.0 through V1.3 in connection with an SM/FSC AI and DIL module failure notification. This is another reason to record the installed revision before ordering a replacement.
FC-SDIL-1608
FC-SDIL-1608
Installation & Configuration Guide
5.1 Verify the Complete Module Identification
Before replacement, record:
- FC- base model
- Complete revision marking
- CC/conformal-coating designation
- Order number, if available
- Safety Manager system revision
- Rack and slot position
- Associated termination hardware
- Field device type
- Channel assignments
Do not use a generic “16-channel digital input” module as a substitute. The has specific NAMUR input characteristics and line-monitoring requirements.
5.2 Verify the Field Interface
The most common replacement error is treating the FC- as a conventional 24 VDC PLC input.
Before wiring, confirm that the existing field circuit is designed for the documented DIN 19234 / NAMUR interface and that the associated BN-1608/termination arrangement matches the system documentation. Honeywell’s specifications explicitly state that the input specifications are used in combination with BN-1608.
Check:
- Field device type
- Loop wiring
- Polarity
- Field wire resistance
- Termination assembly
- Channel assignment
- Line-monitoring configuration
- Earth-fault monitoring arrangement
5.3 Power Requirements
Verify the rack supply before installation.
Honeywell specifies:
- 5 VDC: 160 mA
- 24 VDC: 110 mA
Do not substitute a module based only on mechanical fit. The module’s power requirements and backplane/interface architecture must match the installed Safety Manager configuration.
5.4 Commissioning
After installation, verify each configured channel individually.
Recommended checks include:
- Module recognition by the Safety Manager
- Correct rack/slot identification
- Correct channel assignment
- Normal field-device state
- Input transition response
- Line-monitoring diagnostics
- Earth-fault diagnostic behavior
- Alarm and trip logic associated with the channel
- Correct system status after returning the loop to service
For a safety-system replacement, functional verification should follow the site’s approved Safety Manager maintenance and proof-test procedures.
5.5 Replacement Trap: Revision Matching
FC- has multiple documented certified revisions. Honeywell’s certification record lists CC V1.0 through CC V1.3 under the same base type number.
Therefore, a purchase specification should ideally state:
Honeywell FC- + exact hardware revision + condition + original packaging/documentation requirements.
If the installed unit is V1.1, for example, do not assume that a generic FC- listing represents V1.1 unless the supplier confirms the actual nameplate revision.
FAQ
What is Honeywell FC-?
FC- is a Honeywell Safety Manager 16-channel safe line-monitored digital input module with earth-fault monitoring. The FC version uses conformal-coated construction.
How many inputs does FC- have?
It has 16 digital input channels.
Is FC- a standard 24 VDC digital input card?
No. The documented input interface is based on DIN 19234 / NAMUR characteristics, with a 1.4–1.9 mA switching level. It should not be treated as a generic 24 VDC PLC input module.
What is the difference between FS- and FC-?
Honeywell documents both as variants. FC- is the conformal-coated version, while FS- is the corresponding non-conformal-coated type.
What does CC mean on FC-?
Honeywell’s certification documentation uses the CC revision designation for the FC conformal-coated version, including CC V1.0, CC V1.1, CC V1.2, and CC V1.3.
What is the FC- loop supply voltage?
Honeywell specifies an 8 V loop supply with an output range of 7.9–8.7 VDC and output current up to 170 mA, with short-circuit protection.
What is the maximum field wire resistance?
The documented maximum field wire resistance is 50 Ω.
What power does FC- require?
Honeywell specifies 160 mA at 5 VDC or 110 mA at 24 VDC.
What revisions of FC- are documented?
Honeywell’s certification record documents CC V1.0, CC V1.1, CC V1.2, and CC V1.3 for FC-.
What should be verified before purchasing a replacement?
Verify the complete FC- revision, conformal-coated designation, Safety Manager release, field termination/BN-1608 arrangement, and installed channel configuration. Matching only the base part number is not sufficient for a safety-system spare.
