Beckhoff KL5101, Документация

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Access from the user program
KL5101 34 Version: 3.1
Fig. 16: Register mode control byte
The control or status byte occupies the lowest address of a logical channel. The corresponding register
values are located in the following 2 data bytes. (The BK2000 is an exception: here, an unused data byte is
inserted after the control or status byte, and the register value is therefore placed on a word boundary).
Example 1:
Reading register 8 in the BK2000 with a KL5101 and the end terminal:
If the following bytes are transferred from the controller to the terminal,
Byte Byte 3 Byte 2 Byte 1 Byte 0
Name DataOUT, low byte DataOUT, high byte Not used Control byte
Value 0xXX 0xXX 0xXX 0x88
the terminal then returns the following type designation (0x0BCE 0x13ED corresponds to the unsigned
integer 5101).
Byte Byte 3 Byte 2 Byte 1 Byte 0
Name DataIN, low byte Data IN, high byte Not used Status byte
Value 0xED 0x13 0x00 0x88
Example 2
Writing of register 31 in the BK2000 with an intelligent terminal and the end terminal:
If the following bytes (user code word) are transferred from the controller to the terminal,
Byte Byte 3 Byte 2 Byte 1 Byte 0
Name DataOUT, low byte DataOUT, high byte Not used Control byte
Value 0x35 0x12 0xXX 0xDF
the user code word is set and the terminal returns the register address with the bit 7 for register access as
acknowledgement.