05.91
14 Command Channel (DB 41)
14.3 User interface signals
Time pattern for NC function start via command channel
Request bit
DB 41 DR 0
Response
time PLC
max. 20 ms
Start of
function
3 - 10 ms
depending
on NC
CPU load
Function executed
message
(1)
Response
time NC data
transfer max.
20 ms
(b)
(a)
Time axis
(a)
By user
(b)
By PLC operating system
(1)
Internal signals of no significance to user
Strobe to NC (1)
Action bit com-
mand channel
(1)
Function active
(1)
t
Response
time PLC
max. 20 ms
Response
time NC
max. 20 ms
Response
time PLC
max. 20 ms
Function
duration
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HE02
14–7
SINUMERIK 880 (PJ)