M91-t4-r6-zk1 Manual

The M91-t4-r6-zk1 is designed for "fit and forget" operation, but the manual recommends:

The "T4" and "R6" designations in the model name refer to its physical and functional configuration: M91-t4-r6-zk1 Manual

The manual explicitly advises against using photocopied or scanned versions from unknown sources, as wiring diagrams may be misaligned, leading to short circuits. The M91-t4-r6-zk1 is designed for "fit and forget"

The likely refers to a 4-pin input terminal block or a 4-channel transistor logic interface. as wiring diagrams may be misaligned