Expandable compact PLC

Moeller Electric has added a new programmable logic controller to its well established and successful PS4 range.

Moeller Electric has added a new programmable logic controller to its well established and successful PS4 range.

The new PS4-271-MMI, which operates directly on either 230 or 115V AC lines, is specifically aimed at the building services market and can be used as a stand-alone building controller for controlling and monitoring central heating, air-conditioning, lighting, illuminated signs, extraction fans and water systems.

The compact, cost effective unit can be simply and easily expanded either locally or remotely via a variety of network interfaces.

These allow it to be used with distributed I/O in large plants or buildings and as part of an integrated building control system.

The PS4-271-MMI features 12 digital inputs and eight digital outputs that can also be directly connected to the required AC voltage.

There are four analogue inputs, two of which can be used as current or voltage inputs, and two as resistor inputs for Pt1000 or Ni1000.

Direct connection to the majority of common temperature sensors in use today means that the new PLC can be used for the direct control of lighting and entry systems.

The four analogue outputs provided can be used for voltage and current outputs.

The high power 12A relay outputs enable direct connection to a host of devices without the need for interfacing relays, unlike most competitive PLCs.

User memory capacity of the PLC is 24Kbyte with a useful additional 32Kbyte available.

The cycle time for the unit is 1æs, and there is also an onboard real time clock.

The unit's integrated interfaces give the PLC a high degree of flexibility.

Two separate interfaces, RS232 and RS485, are provided for networking and programming, they can both also be used for transparent data communication.

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