Access type:
Select an access type (function code) and change the value of the READ or WRITE register
parameter according to the selected access type.
Function code Access type Description
1 Read Coils Reads from coils
2 Read Discrete Inputs Reads from discrete inputs
3 Read Holding Registers Reads from holding registers
4 Read Input Registers Reads from input registers
5 Write Single Coil Writes to single coil
6 Write Single Register Writes to single register
15 Write Multiple Coils Writes to multiple coils
16 Write Multiple Registers Writes to multiple registers
23 Read / Write Multiple Registers Reads from or writes to multiple registers
Trigger:
Select conditions for command transmission.
Access type Description
Cyclic Commands are sent periodically.
Enter a transmission interval in the Cycle time field.
Rising edge Commands are sent at the rising edge of a Boolean trigger variable.
The trigger variable area is defined in the I/O Mapping tab.
Application Commands are sent using the ModbusChannel function block in a user
program.
READ register settings
Item Description
Offset Specifies the starting address from which read operation is to be started.
For SP15, do not specify of
fset "65535".
13.3 MODBUS
WUME-GM1RTXOP-01 13-35