S5-115F Manual
Communications Capabilities
Important for all connections with the S5-115F
Note
Incoming messages cannot be accepted by the S5-115F until the subunits have been
synchronized. You should therefore organize data transmission to the S5-115F so that
there is an interval of at least 100 ms between receipt of each message.
7.2.1
Nonsafety-Related Connection between S5-115F Slaves and the Master
Controller
Nonsafety-related connection between a master controller of the S5 family and one or more
S5-115F slaves is used, for instance, to transmit
•
Nonsafety-related input data in connection with operator-process communication
•
Nonsafety-related output data in connection with process visualization.
Note
A connection between a number of S5-115F slave PLCs is always safety-related.
Nonsafety-related interslave traffic is not possible.
Data traffic
A slave needs the following items to exchange data
•
A slave number (1 to 30)
•
A Send mailbox
•
A Receive mailbox
•
Coordination bytes
Send and Receive mailboxes
The Send and Receive mailboxes contain send and receive data and can hold up to 64 bytes for
master-slave traffic.
You must configure the following with COM 115F for nonsafety-related connections:
•
Length of the mailboxes
•
Location of the mailboxes
- in a data block
or
- in a flag area.
Note
The length of the messages sent by the master must be identical to the mailbox length
configured for the slaves. If your master messages are shorter, you must pad them to
the configured mailbox length.
EWA 4NEB 811 6148-02
7-3