Operating Instructions
IS1 PROFIBUS 3.00 E
- Technical alterations reserved -
36
PROFIBUS DP interface for IS1+
2.11 Line Redundancy
Line Redundancy may be used with 9440 CPM to enhance the availability of the IS1 system even if a
transmission path has been broken. Line Redundancy should not be used in combination with
redundancy according to PNO specification
CPM redundancy according Stahl specification
Line Redundancy is no longer supported by the 9442 CPU
Redundancy to 9442 CPU Redundancy
Line Redundancy is suitable for non-redundant PROFIBUS Masters.
In order to do this, the two fieldbus isolating repeaters, Type 9185, are interconnected at the X
2
interface with
a PROFIBUS DP cable via Sub D connectors and connected to the PROFIBUS Master (PLC, process
control system (DCS)). One PROFIBUS DP cable with Sub D connector is connected to each X
3
interface of
the 9185, and connected to the two X
1
and X
2
interfaces of the CPU & Power Module (CPM), Type 9440.
The PROFIBUS line between the fieldbus isolating repeaters and the IS1 field stations (CPM, Type 9440)
thus has a redundant structure.
Data is exchanged via both channels and is evaluated in the CPM, Type 9440, with an internal logic.
Data arriving first is prioritized and the other data is rejected. If one line suffers a fault, data transmission
continues undisturbed between automation system and IS1 field station. If the disturbed channel is
operational again, redundant data traffic resumes automatically. The outputs in the connected I/O modules
revert to safety position after the hold time configured user-specifically only if both transmission paths
between PLC and the CPM, Type 9440, are broken. If a disturbed channel is operational again or if both
disturbed channels are operational again, data communication resumes automatically. Faults on the two
redundant transmission paths are signaled in the PROFIBUS diagnosis telegram and optionally in the IS1
DTMs or in IS Wizard .
Devices supporting Line Redundancy:
Zone
Type
Power supply
Protocol
as of Release
Interface
CPM / FB-TÜ
PLC
1
9440/22-01-11
24 V DC
PROFIBUS
A
01-32, 02-32
X1 / X2
-
1
9940/22-01-21
90-250 V AC
PROFIBUS
B
01-32, 02-32
X1 / X2
-
2
9440/15-01-11
24 V DC
PROFIBUS
G
01-32, 02-32
X1 / X2
-
1 (bus) 9185/11-35-10
24 V DC
-
D
01-02
X3
X2
2
9185/12-45-10
24 V DC
-
D
01-02
X3
X2
Example with Zone 2 CPMs 9440
9185
Fieldbus
Isolating
Repeater