Technical data

7.3.3 Monitoring the Data Transmission
The data transmission can be monitored best by using two PGs. Connect
one PG to one CPU and display the data blocks, the status word (ANZW)
and the parameter assignment error byte (PAFE) with which the data
transmission can be monitored. The following table lists the blocks, flag
words and flag bytes relevant for checking this example.
The data words in the DBs must change in rapid succession. If this is not
the case, there is a transmission or parameter assignment error and the
type of error can be found by evaluating the ANZW and PAFE bits.
Section 7.1.2 explains the significance of the bits in ANZW and PAFE.
These bytes must be continuously evaluated to check the data transmission
and to be able to localize and remedy any errors which may occur.
❑
PLC 1 PLC 2
DB transmitted/received
data
DB 10 (DW 1)
DB 12 (DW 1)
DB 20 (DW 1)
DB 22 (DW 1)
ANZW
FB 120 SEND
FB 121 RECEIVE
FB 244 SEND
FB 245 RECEIVE
PAFE
FB 120 SEND
FB 121 RECEIVE
FB 244 SEND
FB 245 RECEIVE
FW 10
FW 110
FY 15
FY 115
FW 20
FW 210
FY 25
FY 215
Table 7.5 DB Transmitted and Received Data, Status Words and PAFE Codes
S5-S5 Communication B8976060/02
Volume 1 7 - 22