What are the categories of PLC extension modules
PLC is a commonly used controller in the field of industrial automation control, and there are now PLCs with modular expandable functions. So, what types of functional blocks can be extended for modular PLCs?
- Add communication modules for PLC communication interfaces, such as Bluetooth extension communication modules.
- Digital IO function block, such as relay output IO.
- Power expansion module, used to increase the upper limit of device power supply.
- Analog IO function block, such as PT100 input type IO module.
What is the difference between PLC expansion unit and expansion module
Expansion unit refers to an independent expansion product, usually connected to the expansion port or expansion slot of a PLC.
Expansion module generally refers to the module used to expand other functions, such as communication functions, on the CPU of PLC.
The expansion unit includes input and output (built-in power supply, divided into AC and DC inputs), while the expansion module only has input and output (power supply obtained from the basic power supply or expansion unit), one requires separate power supply, and the other does not require separate power supply; And the unit refers to the software, while the module refers to the hardware.
