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PLC Two-Plus & Two-Plus-Two

SPD Filters

Three-Wire Grounded / Two-Wire Ungrounded

Data Line Filters

Three & Four Wire Data Bus Protection


Among other applications, the PLC Protector can be applied to PLC’s, robotics, CAD/CAM, alarm systems, scanners, controllers, medical equipment and virtually all microprocessor‐based ”critical” equipment.


Typical PLC Protector uses include the oil industry, refineries, the pulp and paper industry, the textile industry, water and sewer treatment plants, the petrochemical industry, the food processing industry and virtually all types of manufacturers.


The PLC 2+2 and 2+0 filters increase up‐times to the maximum, which increases production and results in higher profits. It also offers substantial savings through decreased down‐time and decreased repair costs.

This solid state semi‐conductor series offers surge protection for line to line and lines A, B, common and shield to ground. It is designed for 3 wire and 4 wire data bus communications that require approximately 5Vdc difference between line and line. It is compatible with DeviceNet, Data Highway Plus, Modbus Plus, Genius Bus, Simatic Net, Profibus, CompoBus/S, RS485, RS422, Twisted Pair, 3 Wire and Industrial Networks up to 100Mb/sec.

Series Hybrid Design

Sine wave tracking TVSS technology ensures fast and immediate attenuation of the harmful spikes, transients and both common and normal mode noise. The added data line filter ensures that the 2+2 Filter will protect the attached network/communication link from all potential problems. The Always On™ 2+2 filter is the only filter that offers all modes of protection on both the power line and the data line.

The Always On™ 2+2 one‐two punch will guarantee maximum runtimes for your equipment, resulting in higher production and profits, while decreasing downtime and equipment repair costs.

Suppression / Attenuation

The cutting edge technology contained in the Always On™ 2+2 and 2+0 filters allow normal mode noise attenuation up to 85dB and for common mode noise attenuation up to 50dB. It filters bandwidths of 10kHz to 100MHz, with a total peak surge current of 32,500 amps, while providing a response time of less than 1 nanosecond.

Functioning Indicator

The easily seen three colour LED informs the user of the working status of the Always On 2+2 and 2+0 filter. Optional Communications: Form A, B or C contacts allow the user to monitor the status of the 2+2 or 2+0 filter from a remote location.

Mounting Options

The 2+2 and 2+0 come standard with J‐Rail or an optional flange mounting is available. Product Warranty: Always On™ 2+2 and 2+0 filters are warranted against failure for two years (exchange or repair warranty).

5‐Year User Guarantee

Always On™ guarantees against electrical damage to the protected power supplies by power aberrations for 5 years.