D301271 1013 - FGEN - multi protocol
9-17
Modbus registers
9.3.4 Register 1130h: „Modbus-Connection-Mode“
This register defines the behavior of the Modbus connections:
9.3.5 Register 1131h: „Modbus-Connection-Timeout“
This register defines after which time of inactivity a Modbus-connection is closed through a Disconnect.
9.3.6 Register 0×113C und 0×113D: „Restore Modbus-Connection-Parameters”
Registers 0×113C and 0×113D serve for resetting the parameter-register 0×1120 and 0×1130 to
0×113B to the default settings.
For this purpose, write "0×6C6F" in register 0×113C. To activate the reset of the registers, write "0×6164"
("load") within 30 seconds in register 0×113D.
Both registers can also be written with one single request using the function codes FC16 and FC23.
The service resets the parameters without saving them. This can be achieved by using a following
"save" service.
Table 9-8:
Register 1130h:
Modbus-
Connection-
Mode
Bit Name
–Description
15 to 2 reserved
1 MB_ImmediateWritePermission
– 0: With the first write access, a write authorization for the respective Modbus-connection
is requested. If this request fails, an exception response with exception-code 01h is
generated. If the request is accepted, the write access is executed and the write
authorization remains active until the connection is closed.
– 1: The write authorization for the respective Modbus-connection is already opened during
the establishment of the connection. The first Modbus-connection thus receives the write
authorization, all following connections don’t (only if bit 0 = 1).
0 MB_OnlyOneWritePermission
– 0: all Modbus-connections receive the write authorization
– 1: only one Modbus-connection can receive the write permission. A write permission is
opened until a Disconnect. After the Disconnect the next connection which requests a
write access receives the write authorization.
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