Technical data

8.4.1 Program Description
Two SIMATIC programmable controllers with the L2 addresses 1 and 2 are
to exchange data via the SINEC L2 bus. The transmitted and received data
will be written to data blocks (DB).
Station 1, an S5 155U PLC, uses SAP 2 as the service access point. For
station 2, an S5 115U PLC, SAP 3 has been selected.
The data exchange uses an SRD service on station 1 and an RPL_UPD_S
service on station 2.
. .
C
P
C
P
L2
interface
Bus cable
Bus terminal 1
with terminal cable
Bus terminal 2
with terminal cable
PLC1 (S5-155U)
PLC2 (S5-115U)
PG
interface
(AS511)
PG
interface
(AS511)
P
L
C
P
L
C
Terminator
activated
PG-
inter-
face
(AS511)
Fig. 8.16 System Structure with all Hardware Components
Free Layer 2 Communication B8976060/02
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