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Low Cost, Ultra Compact
H-series Relay-Ladder Programmable Controllers

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I. Introduction

The H-series Programmable Logic Controller is a family of small, low cost, single-board Programmable Logic Controllers (PLCs). Presently, the series spans from the T20H with 12 inputs, 8 outputs to the T64H with 40 inputs and 24 outputs. Members of the H-series controller family differ mainly in the number of I/Os (inputs/outputs), and the type of I/Os they carry (relay or transistor outputs, PNP or NPN types, opto-isolator inputs or high voltage inputs, etc). Since each different PLC model has different wiring requirements, please refer to their respective Installation Guide on the wiring methods and installation details. The number of I/Os, timers, counters, internal relays as well as the maximum allowable program steps are also stated in the Installation Guide.

The H-series PLCs includes the T20H-npn, T28H-Relay, T40H-Relay, T44H-pnp, T44H-npn and the T64H-Relay. The following table summarizes the number of I/Os, timers, counters and internal relays for each existing model:

Please note that For T20H, T28H, T40Hand T44H, an enhanced CPU option is available which provides 256 internal relays, 40 timers, 40 counters and 800 steps. These PLCs are given respective model names such as T20Hplus-npn, T28Hplus-Relay, T40Hplus-Relay, T44Hplus-pnp and T44Hplus-npn.

II. Hardware Specifications

H-series PLCs Hardware Specification Table
Installation Guide in Microsoft Word 6.0a format

III. Software Features and Programming Methods

Show Software Features with graphics (70+K bytes)

Download fully functional free evaluation copy of TRiLOGI Software

IV. Host Communications

All H-series PLC have built-in communicaiton capability which enable a host computer to send command to read or alter any of the internal logic states of inputs, outputs, relays, timers or counters.  Click here to download the Communication Protocols.