Mitsubishi Electric FR-CC2-N Series Instruction Manual page 131

• The communication check time by query communication includes a no-data time (3.5 bytes).
This no-data time differs according to the communication speed, so take this no-data time into consideration when setting
the communication check time.
Example: RS-485 terminal communication, Pr. 539 = "0.1 to 999.8s"
Query communication
Converter unit (slave)
Converter unit (slave)
Communication
check counter
Broadcast communication
Converter unit (slave)
Converter unit (slave)
Communication
check counter
130
5. PARAMETERS
5.7 (N) Communication operation parameters
Query Message1
PLC (master)
PLC (master)
Pr.539
ALM
Query Message1
PLC (master)
PLC (master)
Data absence time
(3.5 bytes or more)
Pr.539
ALM
Query Message2
Data absence time
(3.5 bytes or more)
Response Message1 Response Message2
Check start
OFF
Query Message2
Fault
(E.SER)
Check start
OFF
Fault
(E.SER)
Time
ON
Time
ON