3.6
Operation in the SINEC
L1
local area network
The SINEC L1 local area network is used
for interconnecting
programnabl e con-
trol
l
ers of the
l
ow-end performance
range and operates on the Master-Slave
principle.
The CP 530
comrnun
i
cations processor
is always the Master, and the slaves
the
CPUs of all small PCs. Each slave
is assigned a
s1 ave number under which
it
is referenced. Data can be inter-
changed between the master and up to
30 slaves, as well as between the indi-
vidual slaves. In the case of the
S5-101U,
the slave number, the coordinating flags
and the send and receive mailboxes are
defined as follows:
Slave
numk
The slave number is stored at the beginning
of the user program
(PBlIFB1) together
with an indentifier.
In addition to the actual data, control
and security information, which the
STEP 5 user program can access through
a coordinating flag word, is also trans-
mi
tted
.
The actual data are deposited in a receive
mailbox and a send mailbox which the
user can access with load and transfer
operations.
header
SF
63.0
LKF
..
Identifier
Nos.
1...30
RECEIVE coordinatinq
fl
aq b.yte (KME)
SEND coordinating
fl
aq byte (KMS)
Flag byte FB
61
is used. Flag byte FB
62
is used.
M61.7
.
.
.
M 61.0
I
I
1-r~
Receive error in last transfer
ERROR with master
SLAVE
FAIL
A
slave in the network has failed
BUS-RUN BUS is in RUN state
PG-BIT Programmer requests the bus access
INTERRUPT This message is accompanied by an interrupt
EMPF-ERK Operating system may accept data from the bus into
the receive
mailbox
Bit from bus master
M62.7
.
M
62.0
Send error In last transfer
Slave permits programmer access
SEND-ERK User releases send
mailbox for sending to the bus
Bit for bus master
The coordinating flags are affected by the operating system of the PC and
can therefore not be used as flags in the normal sense.
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