I/O error exists in loop boolean

Description

An error occurred while creating a logical expression using the RAPID instruction SetupCyclicBool. Signal arg is unknown to the system.

Consequences

Program execution stops immediately.

Possible causes

1. Connection to I/O device lost.
2. If the signal is defined in the RAPID program, it must be connected to the configured signal using the instruction AliasIO.

Recommended actions

1. Reestablish the connection to the I/O device.
2. Use AliasIO to reconnect the RAPID program-defined signal.