Modbus TCP
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10.7 Register 0x1130: Modbus Connection Mode
This register defines the behavior of the Modbus connections:
10.8 Register 0x1131: Modbus Connection Timeout
This register defines after which time of inactivity a Modbus-connection is closed through a Discon-
nect.
10.8.1 Behavior of the BUS LED
In case of a Connection Timeout the BUS LED's behavior is as follows:
Warnings
3– -
2– -
1– -
0 DiagWarn Diagnostics available at the device.
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 0x01 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
connection establishment. 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.
Connection-Timeout BUS-LED
time-out green, blinking
Bit Name Description
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