Appendix B PKW0 telegram
Operation manual
ID 441687.04
WE KEEP THINGS MOVING
51
13
The bits for the parameter number, job and response ID are located within the
two-byte parameter ID. (The SPM bit for spontaneous message processing is not
supported.) The master sends to the inverter the job ID, the parameter number,
the subindex and, during write accesses, the new value. The device then answers
with the response ID, parameter number, subindex and, during read accesses,
with the current value. All values are represented as double words (4 bytes in
length) on PROFIBUS. This means that the master no longer needs to recognize
and distinguish between the data sizes of byte, word and double word. The job ID
is used to differentiate between reset, write and read jobs. The master (PLC) must
repeat the same job at least until the applicable response arrives from the
PROFIBUS slave.
Fig. 13-1 Organization of job identifier and PNU
The devices of the 5
th
generation of STÖBER inverters respond to the same bit
positions with the response ID. The response ID remains unchanged until the
current job is finished. The job ID must be maintained constant as long as this has
not occurred.
The inverter deletes all response bytes together with the response ID 0. With
response ID 2, the parameter number and the subindex are echoed from the job
in the response. The inverter continues sending the complete response until the
master formulates a new job. With read accesses to indicator values, the inverter
Job ID
Meaning
0
No job (reset job)
1
Request parameter value (read)
3
Change parameter value (write)
Rest
Do not use!
Response ID
Meaning
0
No response or also: OK for job ID "no job"
2
Transfer parameter value (sent to master)
7
Job cannot be executed
Byte
Bytes for parameter ID (PKW)
PKE IND
PWE
0 1 2 3 4 5 6 7
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
Parameter number (PNU)
Job ID
S
P
M
PKE : Parameter ID
IND : Subindex in byte 2. Byte 3 is reserved
PWE : Parameter value