Spectrum Controls 1746SC-INI4VI Analog Input Module for Allen-Bradley SLC 500
4-Channel Isolated Analog Input
SLC 500 I/O Module
1746SC-INI4VI datasheet
Place of Origin:
USA
Brand Name:
Allenbradley
4-Channel Isolated Analog Input
,SLC 500 I/O Module
,1746SC-INI4VI datasheet
1746SC-INI4VI
4-Channel Isolated Analog Input Module
REQUEST A QUOTE →1746SC-INI4VI is a Spectrum Controls isolated analog input module for Allen-Bradley SLC 500 systems. It provides four individually configurable channels for acquiring current or voltage signals from field instrumentation.
Product Overview
Module identityMulti-Channel Signal Acquisition
Designed for analog measurement within an SLC 500 I/O rack, the module supports independent channel selection and software-based setup. Its onboard functions include programmable filtering, automatic calibration and error checking.
Technical Specifications
Specification bookTechnical data is arranged as four reference chapters. The main signal and performance sections are opened for quick review; installation and environmental details remain available below.
Chapter I — Input Channels & Signal Ranges
| Number of Channels | 4 differential, individually isolated channels |
|---|---|
| Current Input Ranges | 0–20 mA; 4–20 mA |
| Voltage Input Ranges | 0–5 VDC; 1–5 VDC; 0–10 VDC; -10 to +10 VDC |
| Input Selection | Current or voltage, selectable independently by channel |
| Conversion Method | Sigma-Delta A/D conversion |
| Resolution | 16-bit |
| Current Resolution | 312.8 nA per count |
| Voltage Resolution | 312.8 µV per count |
| Input Impedance | Current: less than 250 Ω; voltage: greater than 220 kΩ |
Chapter II — Accuracy, Filtering & Response
| Current Input Accuracy | 0.10% of full scale at 25 °C; 0.25% at 60 °C (datasheet) |
|---|---|
| Voltage Input Accuracy | 0.25% of full scale at 25 °C and 60 °C (datasheet) |
| Selectable Filter Frequencies | 50 Hz, 60 Hz, 250 Hz and 500 Hz |
| Minimum Update Time — Current | 14 ms with 500 Hz filters and all channels enabled |
| Minimum Update Time — Voltage | 18 ms with 500 Hz filters and all channels enabled |
| Step Response | 8 ms at 500 Hz; 16 ms at 250 Hz; 66.7 ms at 60 Hz; 80 ms at 50 Hz |
| Common-Mode Rejection | 99 dB at 1 kHz, 25 °C; 150 dB at 60 Hz (datasheet) |
| Normal-Mode Rejection | 98 dB at 50 Hz and 60 Hz (datasheet) |
| Calibration | Factory calibrated; automatic calibration can be enabled |
Chapter III — Isolation, Protection & Diagnostics
| Opto-Electrical Isolation | 750 VDC channel-to-channel and field wiring-to-backplane (manual) |
|---|---|
| Continuous Isolation Rating | 125 VAC continuous for field wiring-to-backplane and channel-to-channel (datasheet) |
| Input Overcurrent Protection | 33 mA continuous; 70 mA transient |
| Input Overvoltage Protection | 50 VDC continuous, INI4VI only |
| Diagnostics | Startup diagnostic tests, onboard error checking, channel status bits and LED indicators |
| Open-Circuit Detection | Open input circuit indication; response state is selectable |
| LED Indicators | Four green channel status indicators and one green module status indicator |
| Thermal Dissipation | 3.25 W maximum |
Chapter IV — Power, Mounting & Environment
| Backplane Current | 550 mA at 5 VDC; 0 mA at 24 VDC (typical) |
|---|---|
| Backplane Power | 2.75 W typical |
| Rack Slot | Any 1746 I/O module slot except slot 0 |
| Terminal Block | Removable terminal block, supplied |
| Wire Size | One 12–24 AWG wire per terminal, maximum |
| Recommended Cable | Shielded twisted-pair; Belden 8761 or equivalent |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Storage Temperature | -40 to 85 °C (-40 to 185 °F) |
| Relative Humidity | 5–95%, non-condensing |
| Hazardous Location Classification | Class I, Division 2, Groups A, B, C and D |
| Certifications | UL/cUL, CE, UKCA, FCC and CMIM (datasheet) |
Configuration & Maintenance
Commissioning notesConfiguration and troubleshooting are organized around channel setup, signal review and module status.
Channel configuration: Set the enable state, input range, data format and filter frequency for each channel through the module configuration settings.
Signal and status review: Use input data and status words to review channel readings, configuration state and reported errors. For fault investigation, inspect open-input indications, range status, channel errors, field wiring and LED states.
Application & Failure Scenarios
Maintenance contextIn an SLC 500 control system, the module receives isolated current or voltage signals from field instrumentation for PLC monitoring and process control.
Analog Signal Problems
Missing, unstable or unexpected readings can lead maintenance teams to inspect the field signal, input wiring, channel settings and module condition.
Channel or Module Errors
Open-input indications, range errors or channel status faults may prompt checks of the sensor loop, terminal connections and input module.
Production Interruption
Unreliable analog measurements can affect dependent monitoring or control functions. Accurate part identification helps reduce replacement delays during maintenance.
Delivery & Warranty
Order supportFrequently Asked Questions
Product enquiriesWhich PLC system is the 1746SC-INI4VI designed for?
Can the module accept both current and voltage signals?
What input ranges are supported?
How can an input channel fault be investigated?
What should be confirmed before ordering a replacement?
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