7.2.10 Modbus/TCP mode of transmission
The usable contents of Modbus/TCP is basically structured like Modbus RTU.
7.2.10.1 Modbus RTU message telegram
Modbus messages are added by a sending device into a telegram which has a defined start and end
point. The TCP/IP frame enables receiving devices to identify the beginning and end of the message.
Incomplete messages must be detected and result in an error.
Modbus RTU messages
The whole message telegram must be transmitted as a coherent flow of characters.
7.3 Resetting errors
Depending on the settings and operating state of the device, errors can be reset in various ways:
• When using control via parameter
Local/Remote 412 = Statemachine:
Set bit 7 of control word
Control word 410= 0x8000.
• By pressing the stop button of the control panel.
Resetting by pressing the STOP button is only possible if Parameter
Local/Remote 412 permits
control via the control panel.
• Via parameter
Error acknowledgment 103 which is assigned a logic signal or a digital input.
A reset via a digital signal can only be carried out when parameter
Local/Remote 412 permits this
or when an input with the addition (hardware) is selected in the case of physical inputs.
Some errors will occur again after an error reset. In such cases, it may be neces-
sary to take certain measures (e.g. moving from a limit switch in the non-disabled
40
ACU
Modbus/TCP 10/13
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