BECKHOFF BK3xx0 - Manual (Page 59)

Notes on the Documentation
Fieldbus Components 57
Terminal Composition
The terminal composition can be read by DPV1. A word is transmitted for each terminal containing the terminal
number for complex terminals (KL15xx, KL25xx, KL3xxx, KL4xxx, KL5xxx, KL6xxx, KL8xxx), and the length and type
information for digital terminals:
Bit Value Description
0 1
bin
Digital terminal has inputs
1 1
bin
Digital terminal has outputs
2-7 - reserved
8-14 X Length in bits
15 1
bin
Always 1
bin
(indicates that the terminal is digital)
Reading the terminal composition
The terminal composition is represented in the DPV1 addressing as follows:
Slot number Index Byte Description
0-1 Number of the Bus Coupler
2-3 Value for terminal 1
... ...
9
46-47 Value for terminal 23
0-1 Value for terminal 24
... ...
10
46-47 Value for terminal 47
11 0-1 Value for terminal 48
... ... ...
18 46-47 Value for terminal 239
0-1 Value for terminal 240
... ...
0
19
30-31 Value for terminal 255
Checking the terminal composition
The same data can also be accessed by a DPV1 Write. In this case the Bus Coupler compares the value that has
been written with the true value, returning a negative DPV1 Write response if the data does not agree. This permits
more precise checking of the terminal configuration than is possible by checking the CfgData.
Error codes in the write response
Error_Code_1 Error_Code_2
0xBE Number of terminals
0xBF First faulty byte in the written data