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Operation as a PROFINET device
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6.4 Process data communication
6.4.1 Control word
The control word is a special process data item used to make settings which are not to be
executed via a conventional process data item.
A command consisting of two bytes can be written to the control word of the management
agent. The device responds with the same command in the status word. Byte 0 specifies
the action and the new status; byte 1 specifies the port number. If a command is to apply to
all the ports, the value 0xFF can be sent instead of the port number. A command should only
be sent once, but never in a process data communication cycle.
6.4.1.1 Additional process data
The IRT switch can transmit the following process data:
– Summary of the link states of all ports (one byte) - each port corresponds to one bit (0 -
Link down; 1 - Link up)
– The slots transmit link information for each port. This includes:
- Link status: (0 - Link down; 1 - Link up)
- Far end fault status: (0 - No fault; 1 - Fault)
- Port enable status: (0 - Enabled; 1 - Disabled)
The settings made for the PROFINET alarms can be saved with the configuration. The
controller can transmit a different alarm configuration to the switch and therefore overwrite
the configuration settings.
Table 6-1 Assignment of the control word
Action Status Byte 0 Byte 1
Power supply On 0x05 0x00
Off 0x06 0x00
Link enable status On 0x20 Port
Off 0x21 Port
Byte 1 1 1 1 1 1 1 1
Bit 7 6 5 4 3 2 1 0
Port - - - - 4 3 2 1
Bit 7 6 5 4 3 2 1 0
Meaning Port
enable
Far end fault Link status