Communication / CBC
03.2010
6SE7087-6QX70 (Version AL) Siemens AG
8.4-22
Compendium Motion Control
SIMOVERT MASTERDRIVES
The parameter value (PWE) is
always
transferred as a double word (32
bits).
Only one
parameter value can ever be transferred in a telegram.
A 32-bit parameter value is composed of PWE1 (least significant word,
3rd word) and PWE2 (most significant word, 4th word).
A 16 bit parameter value is transferred in PWE1 (least significant word,
3rd word). In this case, you must set PWE2 (most significant word, 4th
word) to the value 0.
Source for the ON/OFF1 command (control word 1, bit 0):
P554 (=22A Hex)
Change parameter value of index 1 to the value 3100.
Parameter value (PWE)
3rd word
(PWE1)
Byte 5
Byte 4
Bit No.:
15
8 7
0
HEX value
3
1
0
0
4th word
(PWE2)
Byte 7
Byte 6
Bit No.:
31
24 23
16
HEX value
0
0
0
0
Bits 8 to 15:
Bits 16 to 31:
Parameter value in the case of 16-bit parameter or low
component in the case of 32-bit parameter
Value = 0 in the case of 16-bit parameter or high component in
the case of 32-bit parameter
Two unambiguous CAN identifiers are needed for parameter
processing, one for the PKW task and one for the PKW reply. In
contrast to other protocols, the CAN protocol only recognizes identifiers
and not node addresses. Practical experience shows, however, that it is
useful to define node addresses here as well for reasons of clarity. For
parameter processing, the individual CAN identifiers of the drive can
thus be generated from the node address (P918 "CB bus address") and
the basic identifier value (P711 / P696 "CB parameter 1").
A parameter on a gray background is only valid for MASTERDRIVES
with CU1, CU2 or CU3.
Parameter value
(PWE) 3rd and 4th
word
Example
Parameter value
CAN identifiers for
parameter
processing
NOTE
