Festo SBO***-Q Series, Manual

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4. Commissioning
4-90
Festo P.BE-SBO-Q-EN en 1602e
4.10.11 Use of the Ethernet interface with Modbus
The device makes available the Modbus protocol for commu­
nication with a higher-level controller. This protocol permits
very wide-ranging output and control possibilities. Inspection
results can be processed again in the higher-order controller.
Support of the Modbus Protocol by the Compact Vision
System must be activated via system parameters. Reading
and writing take place via the data packages defined by
Modbus, whereby the data to be read/written are defined
through memory addresses.
The device not only makes I/Os available via memory
addresses, but also allows access to the results of an inspec­
tion and to the settings of the system parameters.
Certain memory addresses can be both read and written to,
while others can only be read or only written to (
è
tables in
appendix A.6).
The following function codes are supported:
– 3 (Read Holding Registers = reading several 16-bit
registers)
– 16 (Write Holding Registers = writing several 16-bit
registers)
Commissioning:
1. Switch the system off in order to avoid faults or damage.
Disconnect the power supply to the Compact Vision
System and the device to be coupled.
2. Using the specified cables, connect the Compact Vision
System to the device to be connected, e.g. via an Ethernet
switch or hub.
3. Reconnect the power supply.