Technical data

Control Command Byte
Structure of the acknowledgment field for "send control command"
Bit
01234567
reserved = 0
reserved = 0
Unfreeze
Freeze
Unsync
Sync
reserved = 0
reserved = 0
Fig. 11.41 Function Table for Control Command Byte
1st byte
2nd byte
02 hex
Acknowledgment
Length in bytes
00 hex OK
01 hex syntax error in job field
02 hex error in HDB handling
06 hex slave stations not all in the
data transfer phase
08 hex illegal command code
07 hex cyclic control command not possible
because "Free" mode is set.
09 hex no DP slave with the relevant group identifier
is active.
0B hex job cannot be executed because DP polling list
processing is in the STOP mode
Fig. 11.42 Structure of the Acknowledgment Field for "Send Control Command"
B8976060/02 Distributed I/Os (DP)
11 - 73 Volume 1