User guide

3-10
M-4662
3.5 Reading/Writing Data on Another Device from the
MV via Modbus
The MV is a Modbus master.
For Modbus specifications, see section 7.3.
ConguringtheSerialInterface
Set Protocol to Master-M under Serialbasicsettings. See section 3.3 for details.
ConguringtheModbusMaster
◊ Press MENU and then select Menu tab > Basicsettingmode > Menu tab >
Communication (Serial) > Modbusmaster > BasicsettingsorCommandsettings
Basicsettings    CommandSettings
BasicSettings
• Readcycle
Set the read cycle to 125ms, 250ms, 500ms, 1s, 2s, 5s, or 10s.
• timeout
Set the command timeout value to 125ms, 250ms, 500ms, 1s, 2s, 5s, 10s, or 1min.
• Retrials
Set the number of retrials when there is no response from the slave. Select Off, 1, 2, 3,
4, 5, 10, or 20.
• Inter-blockdelay
Set the wait time between commands to Off, 5ms, 10ms, 15ms, 45ms, or 100ms.
• Autorecovery
Set the auto recovery time from communication halt. Select Off, 1min, 2min, 5min,
10min, 20min, 30min, or 1h.
CommandSettings
• Mastercommandnumber
Select 1-8 or 9-16 for the command numbers to be configured.
• Commandtype
Set the transmission command type to Off, R, R-M, W, or W-M.
R: Read the data from the slave into external input channels (16-bit signed
integer)
R-M: Read the data from the slave into communication input channels (32-bit
floating point)
W: Write computation channel data (16-bit signed integer) to the slave
W-M: Write computation channel data (32-bit signed integer) to the slave
R
is selectable on the RD-MV2000 when external input channels (/MC1 option) is installed.
R-M
and
W-M
are selectable when the computation function (/M1 or /PM1 option) is
installed.