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15.5 Loop-Through Mode (OP15 only)
IF1 interface of
The IF1 interface of the OP15 is optionally available for the loop-through
OP15 for loop-
mode of a configuration computer or another OP. This means that
through mode
Figure 15-5 provides an overview of the connections in AS511 loop-through
mode. Standard cables are available for the connections shown in the figure
(refer to the ST80.1 catalog).
Figure 15-5 Connnection Configuration Scheme for AS511 Loop-Through Mode
Constraints in
loop-through
mode
Manual OP5, OP15
( ) J31069-D0840-U001-A2-7618
the PLC can be accessed during operation
a second OP can be connected to a PLC at a reasonable price
OP15
TTY passive
V.24
IF1
V.24
TTY passive
TTY passive
IF2
Print functions of the looped-through OP cannot be used.
The OP does not perform life-bit monitoring, i.e. it cannot detect whether
the PLC is in Stop mode, for example. (Life-bit monitoring continues to
be performed on the PLC.)
System performance may deteriorate due to higher loading of the inter-
face to the PLC.
Electrical Installation
PU 7xx
COM1
(25 pin)
Operator Panel
OP5
OP15
TD/OP with
AS511 protocol
PLC
15-7
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