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PLC addressable –

This system uses the S90C 2 wire addressable communications described above but in addition incorporates a programmable logic controller (PLC). This has many advantages in terms of power and flexibility. We use a Mitsubishi PLC (e.g. FX1N) and a Beijers keyboard display (e.g. E200). This enables us to use standard Mitsubishi programming tools (GX Developer) to write and test the required program. The program is written in ladder logic format which is simple use and understand. Programs can be easily changed on site with a laptop PC. The system can be easily maintained without the need of specialist knowledge from us. This gives confidence to clients who require the security of long term maintainability.

The elements of a PLC addressable system are as follows

Keyboard display

PLC with RS232 interface

S90C controller

Watchdog

24v and 5v dc power supplies

Damper status LEDs (optional)

DCM damper control modules

FCM fan control modules