Technical data

11.5.3 How the CYCLE-SYNCHRONIZED Mode Functions
The following diagram illustrates how the CYCLE-SYNCHRONIZED mode
functions for output bytes.
Explanation of Fig. 11.7:
The output byte information to be transmitted is transferred to the output
area of the CP by the user program.
This transfer is made at the end of the PLC cycle using the "output PIQ"
function, or as shown in the diagram, by direct I/O access.
PLC
Program
Output
area
0
PY1 : 7
9
Data information
transferred on
the L2 bus
HTB-SEND
210 CALL
7
0
nth processing
of the DP polling
list
PY 1:
PY 1:
PY 1:
(n+1) processing
of the DP polling
list
(n+2) processing
of the DP polling
list
PY1 : 7
PY1 : 9
PY1 : 9
PY1 : 1
PY1 : 8
L KH 0007
TPY 1
L KH 0008
TPY 1
L KH 0009
TPY 1
HTB-SEND
210 CALL
L KH 0001
TPY 1
in CP
Fig. 11.7 CYCLE-SYNCHRONIZED Mode: Master Sends to Slave
B8976060/02 Distributed I/Os (DP)
11 - 15 Volume 1