Communications Capabilities S5-115F Manual
7.2.4 Safety-Related and Fault-Tolerant Networking
A safety-related network consisting of several S5-95Fs and S5-115Fs is fault-tolerant if two SINEC
L1 LANs are installed with two SIMATIC S5 PLCs.
SINEC L1 LAN A SINEC L1 LAN B
S5 - 115F : Slave 1
SIMATIC S5
Subunit A
DI DQ R - DI
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Subunit B
R - DI DQ DI
SIMATIC S5
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Subunit B
S5 - 115F : Slave 2
Subunit A
DI DQ R - DI R - DI DQ DI
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Figure 7-11. Safety-Related and Fault-Tolerant Networking of Several S5-115Fs
The multimailbox system of the single-channel SINEC L1 LAN is the basis of this configuration. This
system has a separate mailbox for every data path, which is updated by synchronizing FB 254 SYNC
with the ”SINEC L1 processing” identifier once during the SINEC L1 safety time.
In contrast to the single-channel SINEC L1 LAN in the S5-115F, the two-channel SINEC L1 LAN has
two Receive mailbox systems, one for LAN A, and one for LAN B. It has, however, only one Send
mailbox system.
The two SINEC L1 LANs are not synchronized with one another, so that the nonsafety-related data
in the two SINEC L1 masters are independent of one another from the point of view of both time
and content.
If you have configured the function for sending an error message to the SINEC L1 master, the body
of the error DB with the error message code will be sent to both SINEC L1 masters in the event of a
fault.
7-30
EWA 4NEB 811 6148-02
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