1769-IF4 — Compact I/O 4-Channel Analog Current/Voltage Input Module

The 1769-IF4 is a 4-channel analog input module for the Compact I/O platform, supporting both differential and single-ended wiring for voltage signals (±10V, 0–10V, 0–5V, 1–5V) and current signals (0–20 mA, 4–20 mA). Resolution is 14-bit unipolar or 14-bit plus sign for bipolar ranges, using delta-sigma conversion for stable, low-noise measurement on standard process signals.

Specifications

Parameter	Value
Part Number	1769-IF4
Input Channels	4 (differential or single-ended)
Voltage Ranges	±10V, 0–10V, 0–5V, 1–5V
Current Ranges	0–20 mA, 4–20 mA
Resolution	14-bit unipolar, 14-bit + sign bipolar
Conversion Type	Delta-sigma
Input Impedance	220 kΩ (voltage), 250 Ω (current)
Rated Working Voltage	30V AC/DC
Backplane Current (5V)	120 mA
External Power Required	24V DC, 20.4–26.4V, 60 mA minimum
Operating Temperature	0°C to 60°C

Four Channels, Voltage or Current, No Loop Power From the Module

Each of the four channels independently accepts voltage or current input, and either differential or single-ended wiring depending on the field device and the noise environment. Differential wiring rejects common-mode noise better than single-ended connections, which matters when signal cable runs share conduit or cable tray with power or drive output wiring — a frequent source of analog measurement error in retrofit panels with less-than-ideal cable separation.

The module itself doesn't supply loop power for connected transmitters — an external 24V DC supply (20.4–26.4V, at least 60 mA) is required for the module's own operation and for powering any 2-wire current loop transmitters wired to its channels. This external supply requirement is a common point of confusion during first commissioning: without it connected, channels configured for current input simply won't register a signal, even with everything else wired correctly.

FAQ

Q: Does the 1769-IF4 provide loop power for 2-wire transmitters?

No. An external 24V DC power source must supply both the module's own operation and any loop-powered transmitters connected to its current-input channels.

Q: Can all four channels be configured differently — some voltage, some current?

Yes. Each channel's signal type and range is configured independently through the controller's programming software, allowing voltage and current inputs to be mixed across the four channels.

Q: What's the practical difference between differential and single-ended wiring on this module?

Differential wiring uses two signal conductors referenced to each other rather than to a shared ground, giving substantially better rejection of induced electrical noise — generally the better choice for long cable runs or noisy panel environments. Single-ended wiring is simpler but more susceptible to ground-related noise.

Q: How far should this module be installed from the system power supply?

Compact I/O systems generally limit how many modules can be placed between any given module and the system power supply — verify the specific distance limit for this module against the platform's installation documentation before finalizing a long I/O bank layout.

1769-IF4 Brand New 1769IF4 Compact I/o Input Module Ser B PLC Module