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Low Cost, Compact Relay Ladder Logic Embedded PLCs
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I. Introduction
The H-series PLCs are a family of small, low cost, pure relay-ladder logic (i.e. No
BASIC) based PLCs that are available since 1993. The family spans from the T22H with 12
inputs, 10 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.
All H-series PLCs are original programmable by means of only the DOS version of TRILOGI
software. However, in response to popular customers' request, in Q4/2003 we
introduced the Windows version of the TRiLOGI software - WinTRiLOGI version 3.5, specifically for programming the H-series
and E10+ PLCs.
The H-series PLCs includes the T22H-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 T22H, 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 T22Hplus-npn, T28Hplus-Relay, T40Hplus-Relay,
T44Hplus-pnp and T44Hplus-npn.
II. Hardware Specifications
H-series PLCs Hardware
Specification Table
III. Software Features and Programming
Methods
WinTRiLOGI Version 3.5
- download Help Files here
IV. Host Communications
All H-series PLC have built-in communication
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.
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