Communications Capabilities S5-115F Manual
7.2.5 The Mailbox Transfer Block FB 253
When you have installed a SINEC L1 LAN, it is connected to subunit B of the relevant S5-115F. The
user program accesses the Receive mailbox direct without interposing the FB 253.
If you have installed a two-channel SINEC L1 LAN, you have two Receive mailboxes (LAN A, LAN B).
If you want to use the high availability of the two-channel SINEC L1 LAN, call the mailbox transfer
block 253 MBXT. FB 253 copies the contents of the Receive mailbox of LAN A into the Receive
mailbox of LAN B if an error has been signalled for the data traffic of LAN B. Your program must
then access the Receive mailbox of LAN B. An error message results if there is also a fault in the
other LAN and the system stops.
Call and parameter setting
Parameter Meaning Type Assignment STLData
Type
QSLN Source
slave No.
: JU FB 253
Name : AGF:MBXT
QSLN :
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KF = 1 to 30
Any number between 1 and
30 can be given as the
source slave no. except the
slave's own number. A
Receive mailbox for both
SINEC L1 LANs must be
defined for each source
slave.
KFD
7.3 Programmers for the S5-115F
Use of a programmer for the program test has been described in Chapter 4 of the COM 115F
manual and the role of the programmer in error diagnostics can be found in Chapter 5 of the
COM 115F manual. The procedure for entering data during safety operation is explained in
10.18.2.
The following chapter describes how the programmer can be connected to the S5-115F.
7.3.1 Programmer Connected to the Serial Interface of the CPU
A programmer can be connected to the serial port of each subunit A and B. Please note the
following priorities:
• Restart after STOP
Programmer input data to A are copied to B
• RUN in test mode
FORCE.VAR commands are copied to B by the operating system or the synchronization calls of
the program.
• The programmer can be used to read data from both subunits.
7-32
EWA 4NEB 811 6148-02
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