Section 4
Modbus parameters and diagnostics
4.1
Parameter list
The Modbus parameters can be accessed with PCM600 or via the LHMI path
Configuration/Communication/Modbus/MBS0n
.
Some parameters are not visible in the “Basic” setting visibility mode.
To view all parameters use “Advanced” setting visibility mode in
Parameter Setting tool in PCM600 and LHMI.
Table 42:
Modbus settings
Parameter
Values (Range)
Unit
Step
Default
Description
Operation
1=on
5=off
5=off
Enable or disable this protocol instance
Port
1=COM 1
2=COM 2
3=Ethernet - TCP 1
3=Ethernet - TCP
1
Port selection for this protocol instance.
Select between serial and Ethernet based
communication.
Mapping selection
1...2
1
1
Chooses which mapping scheme will be
used for this protocol instance.
Address
1...254
1
1
Unit address
Link mode
1=RTU
2=ASCII
1=RTU
Selects between ASCII and RTU mode.
For TCP, this should always be RTU.
TCP port
1...65535
1
502
Defines the listening port for the Modbus
TCP server. Default = 502.
Parity
0=none
1=odd
2=even
2=even
Parity for the serial connection.
Start delay
0...20
1
4
Start delay in character times for serial
connection
End delay
0...20
1
4
End delay in character times for serial
connections
CRC order
0=Hi-Lo
1=Lo-Hi
0=Hi-Lo
Selects between normal or swapped byte
order for checksum for serial connection.
Default: Hi-Lo.
Client IP
0.0.0.0
Sets the IP address of the client. If set to
zero, connection from any client is
accepted.
Write authority
0=Read only
1=Disable 0x write
2=Full access
2=Full access
Selects the control authority scheme
Time format
0=UTC
1=Local
1=Local
Selects between UTC and local time for
events and timestamps.
Table continues on next page
1MRS757645 B
Section 4
Modbus parameters and diagnostics
620 series
73
Communication Protocol Manual
