BECKHOFF KL3681 - Manual (Page 34)

Access from the user programm
R9: Firmware version
Register R9 contains the ASCII coding of the terminal's firmware revision level, e.g. 0x3141 (1A)
ASCII
. '0x31'
corresponds to the ASCII character '1' and '0x41' to the ASCII character 'A'. This value can not be changed.
R10: Data length (multiplex shift register)
R10 contains the number of multiplexed shift registers and their length in bits.
R11: Signal channels
Unlike R10, this contains the number of channels that are logically present. Thus for example a shift register
that is physically present can perfectly well consist of several signal channels.
R12: Minimum data length
The particular byte contains the minimum data length for a channel that is to be transferred. If the MSB is
set, the control and status byte is not necessarily required for the terminal function and is not transferred to
the control, if the Bus Coupler is configured accordingly.
R13: Data structure (data type register)
Data type register Meaning
0x00 Terminal with no valid data type
0x01 Byte array
0x02 Structure: 1 byte, n bytes
0x03 Word array
0x04 Structure: 1 byte, n words
0x05 Double word array
0x06 Structure: 1 byte, n double words
0x07 Structure: 1 byte, 1 double word
0x08 Structure: 1 byte, 1 double word
0x11 Byte array with variable logical channel length
0x12 Structure: 1 byte, n bytes with variable logical channel length (e.g. 60xx)
0x13 Word array with variable logical channel length
0x14 Structure: 1 byte, n words with variable logical channel length
0x15 Double word array with variable logical channel length
0x16 Structure: 1 byte, n double words with variable logical channel length
R15: Alignment register
Via the alignment register bits, the Bus Coupler arranges the address range of an analog terminal such that
it starts at a byte boundary.
R16: Hardware version number
Register R16 contains the hardware revision level of the terminal; this value can not be changed.
R29: Terminal type, special version
The special terminal identifier is contained in register R8: KL3681­0000: 0x0000 (0)
dec)
.
R31: Code word register
• If you write values into the user registers without first entering the user code word (0x1235) into the
code word register, the terminal will not accept the supplied data.
KL3681, KS3681 34 Version 2.0.0