Doc. Name:
Setting MODBUS RS-485 communication for Delta products
Rev.: 00
Doc. Code:
134A-P-D1410-APN002-EN
Page 3/11
Setting a communication timeout and delay for a master station (ms)
AH500 series DVP series DOP series IFD9506/7 RTU-EN01
Timeout *Delay Timeout *Delay Timeout Delay Timeout Delay Timeout Delay
VFD-CH2000 200 200 200 200 200
VFD-CH2000
(V1.30 and
above)
105
1
105
1
105
1
105
1
105
1
VFD-CP2000 200 200 200 200 200
VFD-CP2000
(V1.30 and
above)
105
1
105
1
105
1
105
1
105
1
VFD-CT2000 200 200 200 200 200
VFD-CT2000
(V1.31 and
above)
105
1
105
1
105
1
105
1
105
1
VFD-DD 10 10 10 10 10 10 10 10 10 10
VFD-E 35 60 35 60 35 60 35 60 35 60
VFD-EL 15 20 15 20 15 20 15 20 15 20
VFD-L 10 8 10 8 10 8 10 8 10 8
VFD-M 10 8 10 8 10 8 10 8 10 8
VFD-S 25 40 25 40 25 40 25 40 25 40
VFD-VE 10 16 10 16 10 16 10 16 10 16
VFD-VJ 5 6 5 6 5 6 5 6 5 6
Notes:
(1) *Delay: If a the scan time of a PLC is longer than the delay which can be set for the PLC in Table 1, users do not
need to set a delay for the PLC (the delay set for the PLC is 0 milliseconds).
(2) ST: Scan time
2.2 Descriptions of MODBUS RS-485 Parameters
2.2.1 Communication Timeout (Master Station)
After a MODBUS RS-485 master station sends a command to a slave station, there is a period of time that is allowed to
elapse before the slave station replies. If the slave station does not rely during the period of time, a communication
timeout error will occur in the master station, and the master station will stop receiving the reply command sent by the
slave station. The communication timeout set for a master station must be longer than the time it takes for a slave station
to respond to communication.
2.2.2 RS-485 Delay Time (Master Station)
After a MODBUS RS-485 master station receives the reply sent by a slave station, there is a period of time that is
allowed to elapse before the next command is sent. The delay time set for a master station must be greater than the time
it takes for a slave to drop invalid packet.
(61 pages)
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