Analog I/O Modules

An analog I/O module is an expansion module that adds to the PLC input channels reading continuously varying current and voltage signals together with output channels producing reference signals. It is used in applications that measure pressure, level or temperature and give a reference to a proportional valve or inverter, to save space on the rail by combining input and output in a single module. This category mainly contains Schneider Electric Modicon TM3 modules and cartridge modules for the M221, M241 and M200; input-only, output-only and combined models are listed together, and Delta Electronics and GMT models are also available. Select the module according to your PLC series, the number of input and output channels required, the signal type such as current, voltage or temperature sensor, and whether it will be an expansion module or a cartridge. For models with temperature inputs, verify the supported sensor type on the product page. A cartridge is not a substitute for an expansion module: it plugs into the slot on the front of the CPU and offers few channels, whereas TM3 modules are added beside the CPU to increase the channel count.

Products

How to choose Analog I/O Modules

An analog I/O module is an expansion module that adds to the PLC input channels reading continuously varying current and voltage signals together with output channels producing reference signals. It is used in applications that measure pressure, level or temperature and give a reference to a proportional valve or inverter, to save space on the rail by combining input and output in a single module.

  • Separate sensing, motion control, logic processing and operator interface requirements.
  • Select signal type, supply voltage, communication protocol and I/O count for the machine network.
  • Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.

Frequently asked questions

What is Analog I/O Modules and where is it used?

An analog I/O module is an expansion module that adds to the PLC input channels reading continuously varying current and voltage signals together with output channels producing reference signals. It is used in applications that measure pressure, level or temperature and give a reference to a proportional valve or inverter, to save space on the rail by combining input and output in a single module.

What should I compare when choosing Analog I/O Modules?

Select the module according to your PLC series, the number of input and output channels required, the signal type such as current, voltage or temperature sensor, and whether it will be an expansion module or a cartridge.

Where can I find technical details for Analog I/O Modules products?

A cartridge is not a substitute for an expansion module: it plugs into the slot on the front of the CPU and offers few channels, whereas TM3 modules are added beside the CPU to increase the channel count.

Analog I/O Modules Selection Guide: Technical Criteria & Application Standards