1794-IB32 — FLEX I/O 32-Point 24V DC Sinking Digital Input Module

The 1794-IB32 is a 32-point sinking (NPN) digital input module for the FLEX I/O platform, reading 24V DC field signals from pushbuttons, limit switches, proximity sensors, and similar discrete devices. With 32 channels in one module, it consolidates a large input count into a single FLEX I/O position, mounted on a compatible 32-point terminal base for field wiring termination.

Specifications

Parameter	Value
Part Number	1794-IB32
Platform	FLEX I/O (1794)
Input Points	32
Input Type	Sinking (NPN)
Nominal Voltage	24V DC
Operating Voltage Range	19.2–31.2V DC
Input Current (nominal)	4.1 mA
Isolation Voltage	50V continuous
FlexBus Current	25 mA @ 5V DC
Compatible Terminal Bases	1794-TB32, 1794-TB32S, 1794-TB62DS, 1794-TB62EXD4X15
Operating Temperature	0°C to 55°C

High-Density Sinking Inputs for FLEX I/O

Sinking inputs expect a sourcing (PNP) field device — the sensor or switch supplies 24V to the input terminal, with current returning to the module's common. Thirty-two channels in one module makes this the right choice for distributed I/O nodes serving a large sensor population in a single physical area: a packaging machine with many part-presence sensors, a conveyor zone with multiple position switches, or any application where consolidating a high input count into one FLEX I/O slot reduces the number of modules and terminal bases needed in the node.

The module's compatibility with several different terminal base styles — including the 62-pin D-shell bases — means the same input module can pair with either conventional screw/spring terminal wiring or a pre-terminated connector harness, depending on how the installation's field wiring is built.

FAQ

Q: Can sourcing (PNP) sensors be wired to this sinking input module?

Yes — sourcing field devices are exactly what a sinking input module expects. PNP sensors supply 24V to the input terminal; the module's sinking circuitry handles the return path.

Q: Does this module require a specific terminal base, or will any FLEX I/O base work?

It requires a 32-point compatible base — the 1794-TB32, TB32S, TB62DS, or TB62EXD4X15. A 16-point or smaller base will not provide enough terminal positions for all 32 channels.

Q: Is the module individually isolated per channel?

No. The isolation rating applies between the field side and the backplane as a group — channels are not individually isolated from each other, so all connected field devices should share a common ground reference.

Q: Can this module be used in hazardous (classified) locations?

The standard 1794-IB32 carries certification for Zone 2 hazardous locations under applicable standards when installed per the manufacturer's guidelines — verify the specific certification scope against the installation's classified area requirements before specifying.

1794-IB32 New Factory Sealed 1794IB32 FLEX I/O Ser A Input Module