03.99
Communication via CC-Link
Siemens AG
6SE7087-6NX84-0GB0
SIMOVERT MASTERDRIVES
Operating Instructions
4-17
4.8
Handling PKW via CC-Link
The CBL handles the PKW mechanism transparent for the user. With a
set of three command code types the user can read and modify
parameters (16 bit and 32 bit operands) and read parameter
descriptions:
♦
INDEX Command
♦
PKE Command
♦
READ Command
With the INDEX Command
the user sends the index information (IND).
If he wants to write 32 bit parameter the user writes the high word
(PWE2) into written data
. CBL stores the information temporarily and
acknowledges the INDEX Command
. Now the user sends a PKE
Command
. PKE information and low word (PWE1) is transported to
CBL. CBL merges the data (PKE, IND, PWE1 and PWE2) and sends
an PKW request to the converter. Receiving the PKW reply from
converter CBL acknowledges the PKE Command
from user with a
reply code and the verified PWE1. If the user has a 32 bit operand he
can read the high word (PWE2) by an READ Command
.
PKW request
PKE
IND
PWE1
PWE2
PKW reply
PKE
IND
PWE1
PWE2
IND + PWE2
0C00h
ti
me
Reply: o.k (0)
PKE + PWE1
Reply: o.k. (3 or 4)
Reply: o.k. (0)
INDEX Command
READ Command
PKE Command
PLC
CBL
CU
CC-Link
Request channel
Reply channel
PWE1 (low word)
PWE2 (high word)
Fig. 4-7
PKW parameter sequence (example: write 32 bit parameter)
The three command codes differ in the bit coding of bit 10 and 11 of the
command code.
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