C.4 MEMOBUS/Modbus Setup Parameters
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 551
MEMOBUS/Modbus
Communications
C
H5-05: Communication Fault Detection Selection
Enables or disabled the communication error (CE) detection for MEMOBUS/Modbus communications.
Setting 0: Disabled
No communication error detection. The drive continues operation.
Setting 1: Enabled
If the drive does not receive data from the master for longer than the time set to H5-09, then a CE fault will be triggered
and the drive will operate as determined by parameter H5-04.
H5-06: Drive Transmit Wait Time
Sets the time the drive waits after receiving data from a master until responding data.
Note: After changing this parameter, the power must be cycled to enable the new setting.
Figure C.5
Figure C.5 Drive Transmit Wait Time Setting
H5-07: RTS Control Selection
Enables or disables RTS control.
Note: After changing this parameter, the power must be cycled to enable the new setting.
Setting 0: Disabled. RTS is always on.
Use this setting with point-to-point RS-422 communications.
Setting 1: Enabled. RTS switches while sending.
Use this setting with RS-485 communications or when using multi-drop RS-422 communications.
H5-09: Communication Fault Detection Time
Sets the time the communications must be lost before the drive triggers a CE fault.
H5-10: Unit Selection for MEMOBUS/Modbus Register 0025H
Sets the unit for the output voltage monitor value in MEMOBUS/Modbus register 0025H.
Setting 0: 0.1 V units
Setting 1: 1 V units
No. Name Setting Range Default
H5-05 Communication Fault Detection Selection 0 or 1 1
No. Name Setting Range Default
H5-06 Drive Transmit Wait Time 5 to 65 ms 5 ms
No. Name Setting Range Default
H5-07 RTS Control Selection 0 or 1 1
No. Name Setting Range Default
H5-09 Communication Fault Detection Time 0.0 to 10.0 s 2.0 s
No. Name Setting Range Default
H5-10 Unit Selection for MEMOBUS/Modbus Register 0025H 0 or 1 0
Command message Response message Command message
PLC→Drive PLC→DriveDrive→PLC
Time
24 bit length
H5-06 setting
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