Mitsubishi Electric MELSEC iQ-R Series User Manual page 53

■Service request
The following example is a program to notify the controller that a service request has been issued when an error occurs in the
system (when 'DeviceError' (M11) turns on).
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(0) The following operations are performed by turning on 'DeviceError' (M11): a status byte (H1), which is sent back to the controller at the reception of serial
poll, is set; a service request is issued.
7 COMMUNICATION EXAMPLES
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7.2 Program Examples