Festo CPX-CTEL-4-M12-5POL, Description

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4 Commissioning
Festo – P.BE-CPX-CTEL-EN – 1601b – English 27
Unused channels
Input channels to which no device input is assigned are automatically set to the value “0” in the CPX
system.
Output channels to which no device output is assigned are ignored in data transmission.
Sequence at system start
At the start of the system, the CTEL master module checks all I-Ports for connected devices and their
agreement with the selected configuration presetting.
Communication with the host system
To enable a connection set-up between the CPX terminal and higher-order controller, the I/O configura­
tion presetting of the CTEL master module must comply with the entry of the configuration file in
the host system (
è
3.6 Connection with the host system).
4.1.1 Address assignment in the CPX system
I/O bytes are assigned in the CPX system corresponding to the selected configuration presetting.
The assigned address spaces are thereby filled “from below”, that is, the starting point is the least
significant address (LSB). The unused data in the upper address range expires.
The distribution of the device addresses to the address space of the CTEL master module would be as
follows when using the example in 4.1:
Address assignment of the inputs (16 bytes):
Device Device address Input address CTEL
I-Port 1
(unused)
– Byte 0
– Byte 1
– Byte 2
– Byte 3
I-Port 2
(1 byte)
Byte 0 Byte 4
– Byte 5
– Byte 6
– Byte 7
I-Port 3
(unused)
– Byte 8
– Byte 9
– Byte 10
– Byte 11
I-Port 4
(2 bytes)
Byte 0 Byte 12
Byte 1 Byte 13
– Byte 14
– Byte 15
Legend: White = assigned; grey = unused