Sensor Interface and Junction Modules

Choosing Sensor Interface and Junction Modules components

Sensor interface module selection comes down to whether you need a passive multi-sensor junction (simple cable consolidation) or an active interface (with diagnostics, communication to PLC, IO-Link master functions). Passive blocks save wiring; active modules save wiring AND add diagnostic visibility into the field.

Specs to confirm before ordering:

Form: passive junction block (no electronics, just cable consolidation) vs. active interface module (with PLC communication, diagnostics, IO-Link master)
Number of M8/M12 ports for sensor connection
Trunk-side connection: single M12 to PLC, multi-conductor cable to terminal block, AS-Interface, IO-Link, Profinet, EtherCAT, EtherNet/IP
For active modules: protocol and conformance class (Profinet RT vs. IRT, EtherCAT slave, EtherNet/IP CIP)
For IO-Link masters: number of IO-Link ports, supported COM modes (COM1/2/3 speeds), web interface for device parameterization
Power distribution: supply voltage, current rating per port, fused per port for fault isolation
LED indication: per-port status, fault, communication
IP rating — IP65 minimum for machine-mount, IP67/IP69K for harsh environments
Mounting: DIN-rail (cabinet), surface-mount with bracket (machine-mount)

Common gotchas: passive M12 distribution blocks share +24 V and 0 V across all sensor ports — a sensor with a 1 A inrush on one port can dim signal voltage for sensors on adjacent ports if the trunk feeder is undersized. Active interface modules need fieldbus configuration (GSDML/ESI files imported, IP address set, IO-Link device parameterization) before the PLC sees the connected sensors. IO-Link masters configured in SIO mode pass sensor outputs as discrete signals but lose the diagnostic benefits of IO-Link mode; configure in IO-Link COM mode for full functionality.

Typical applications: consolidating 8 photoelectric sensors on a packaging line into one Profinet drop, parameterizing IO-Link sensors centrally from the PLC, providing fused per-port power to prevent one sensor short from blanking the whole drop, and machine-mounting junction enclosures for tight-cabinet retrofits.

For obsolete sensor interface modules, send the OEM part number for a sourcing quote.

Do you stock obsolete junction blocks and interface modules?

Yes. Discontinued Murr MASI early generations, retired Lumberg passive blocks, end-of-life Phoenix Contact SLD codes, and earlier Turck BL interface modules are sourced through our supplier network.

Passive vs. active — when does each make sense?

Passive when you only need cable consolidation (still hardwiring to PLC inputs). Active when you need diagnostics, fieldbus communication, parameterizable sensors, or fault-tolerant power distribution. Active costs more but pays back in commissioning and troubleshooting time.

What is IO-Link and do I need it?

IO-Link is a point-to-point digital protocol between an IO-Link master and IO-Link sensors. It carries process data plus parameter and diagnostic data on the same wire. Useful for centralized parameter management and for sensors with rich diagnostic data. Standard PNP sensors do not become IO-Link by adding a master.

Are per-port fuses worth it?

Yes for installations where one sensor short would otherwise blank an entire drop. Per-port electronic fusing (most active interface modules) isolates the faulted port while keeping the rest of the drop running.

Can I mix sensor brands on one distribution block?

Yes for passive blocks — any sensor with the matching connector style works. For IO-Link masters, IO-Link sensors from any brand work as long as they implement the IO-Link spec compliantly.

What is the warranty?

12-month functional warranty on the module. Damage from over-current, short-circuit beyond the module's protection, or environmental exposure beyond IP rating is not covered.

Sensor Interface and Junction Modules

ifm efector AL1100 Profinet IO-Link Master Module

ifm efector AL1102 Profinet IO-Link Master Module

ifm efector AL1202 Profinet IO-Link Master Module

ifm efector AL1350 IoT IO-Link Master Module

ifm efector AL2325 IO-Link Digital I/O Module

ifm efector AL2330 Compact IO-Link Interface Module

ifm efector AL2341 IO-Link Digital Input Module

ifm efector AL2401 Compact IO-Link Interface Module

ifm efector EBC112 Y/T Cable Splitter

ifm efector EBC113 Y/T Cable Splitter

ifm efector EBC114 Y/T Cable Splitter

ifm efector EBC115 Y/T Cable Splitter

Can't Find The Part You Need?