14. COMMUNICATION FUNCTION
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14.3.6 Retry processing
When a fault occurs in communication between the master and slave stations, the error code in the response
data from the slave station is a negative response code ([B] to [F], [b] to [f]). In this case, the master station
retransmits the message which was sent at the occurrence of the fault (retry processing). A communication
error occurs if the above processing is repeated and results in the error three or more consecutive times.
Similarly, when the master station detects a fault (e.g. checksum, parity) in the response data from the slave
station, the master station retransmits the message which was sent at the occurrence of the fault. A
communication error occurs if the retry processing is performed three times.
14.3.7 Initialization
After the slave station is switched on, it cannot return to communication until the internal initialization
processing terminates. Hence, at power-on, ordinary communication should be started after.
(1) Wait for 3.5 s or longer after the slave station is switched on.
(2) Check that normal communication can be made by reading the parameter or other data which does not
pose any safety problems.
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