The H-series PLCs are a family of small, low cost, pure relay-ladder logic (i.e. not complemented with BASIC programming) based PLCs that are available since 1993. This PLC family is known for it's proven track record and ranges 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.

 

Note : H-series PLCs have been classified as full EOL products and are available only to past customers for field replacements or for special orders. Past users should contact our sales dept to check availability and lead time before placing orders.

Model Name	Inputs	Outputs	Internal Relays	Timers	Counters	Maximum Program Steps	Product Status
T28H-Relay	16	12	128	20	20	400	NOTE : Legacy Product - call for replacement and special orders only
T40H-Relay	24	16	128	20	20	400	NOTE : Legacy Product - call for replacement and special orders only
T22H-npn	12	10	128	20	20	400	NOTE : Legacy Product - call for replacement and special orders only
T44H-npn/pnp	28	16	128	20	20	400	NOTE : Legacy Product - call for replacement and special orders only
T64H-Relay	40	24	256	40	40	800	NOTE : Legacy Product - call for replacement and special orders only

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Hardware Specifications

H-series PLCs Hardware Specification Table

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.