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S5-115U Manual
Coordination Byte for "Receive" (CBR) (Flag byte or high byte in data word)
7
4
2
2
Interrupt
0: no signal
1: data packet is coming as express transmission
REC-PERM
0: The program can fetch data from the Receive mailbox. The operating system has no access.
1: The operating system can retrieve data from the local area network via the Receive mailbox. The program has
no access.
If REC-PERM="1," the operating system fills the Receive mailbox with data. Then the operating system resets
REC-PERM to "0" (=0).
Coordination Byte for "Send" (CBS) (Flag byte or high byte in data word)
7
4
2
2
Interrupt
0: no signal
1: slave wants to deliver an express transmission or wants to overwrite the old message
SEND-PERM
0: The program can process the Send mailbox. The operating system has no access.
1: The Send mailbox is enabled to transmit on the local area network. The programm has no access.
SEND-PERM="1" causes the operating system to transmit the contents of the Send mailbox. Afterwards the
operating system resets the SEND-PERM bit to "0".
Figure 12-5. Structure of the Coordination Bytes for "Send" and "Receive"
EWA 4NEB 811 6130-02b
2
1
0
2
2
2
Error
0: no error
1: error during last data transfer
Slave OFF
0: no slave failed
1: at least one slave failed
LAN RUN
0: local area network is in the "STOP" mode
1: local area network is in the "RUN" mode
PG BIT
0: function not defined
1: programmer requests local area network access
0
2
Error during last data transfer
0: no error
1: programmer requests local area network access
PG BIT
0: function not defined
1: programmer requests local area network access
Communications Capabilities
Information from the bus master
Informationen for the bus master
12-11
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