I mistakenly specified the UT55A-000-00-00 when I purchased it. The UT55A-000-00-00 only has 3 DI input contacts, but can I switch 8 SPs with external contacts?

With the UT55A, you can switch 8 SPs with 3 DI contacts.

Status switch 2

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Mid-level UT55A/UT52A

The UT55A and UT52A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT55A/UT52A also support open networks such as Ethernet communication.

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