TM3DI16 digital input expansion: controller fit, 24 V signals and terminal planning

Schneider Electric TM3DI16 extends a Modicon controller with sixteen 24 V DC digital inputs. It is an input module; it does not provide power outputs for actuators. The common PLC image illustrates the family and should not be taken as the exact terminal diagram for TM3DI16.

Technical specification and selection data

Signal mapping

List the sixteen devices connected to TM3DI16, including their sourcing or sinking behavior and common wiring. Confirm each sensor's supply and input-state thresholds from the current module guide. A similar TM3DI code may change channel count or connection format.

Rack and project fit

Check that the host controller firmware and engineering project support TM3DI16 and that the expansion position is valid. Back up the application and map existing input addresses before replacing a module. Do not assume the PLC will retain addressing if modules are rearranged.

Field checks

With power isolated, inspect screw terminals, cable labels and module coupling. After fitting TM3DI16, verify each channel in the controller diagnostics and through the machine sequence. Record any sensor or wiring fault separately from the module change.

Similar-looking Schneider references

The following codes resemble TM3DI16 in naming or appearance. Ratings, functions and connection details can differ; they are comparison references, not guaranteed substitutes for TM3DI16.

TM3DI16G, TM3DI8, TM3DI8G, TM3DI32K

Before placing an order

For TM3DI16, provide the host-controller reference, module position, input-voltage plan and terminal photo. Confirm TM3DI16 rather than ordering a look-alike TM3 expansion unit with different channel technology.

For TM3DI16, confirm the printed designation, current Schneider Electric documentation, installation conditions and any lifecycle notice before purchase or commissioning.