Siemens SIMATIC S5-95F Manual page 459

Rules for Failsafe Operation of an S5-95F
Circuit Diagram
I/O type E
DQ
Subunit A or B
DI
Sensor 1
Subunit A
DI
Sensor 2
Subunit B
I/O type J
DQ
Actuator
Subunit A or B
I/O type K
DQ
Subunit A
DQ
Subunit B
I/O type L
Coupling relay
DQ
e.g.
subunit A
V
Load
DQ
Coupling relay
e.g.
subunit B
18-8
Table 18-1. Circuit Diagram for I/Os (continued)
Failsafe binary input module
with two-channel sensor and
high-quality line monitoring
Line monitoring via the same
test DQ is possible only
when a short between the
two signal lines can be totally
excluded (e.g. by placing
them in separate non-
metallic-sheathed cables).
Binary output module, not
safety-related
Failsafe binary output module
with failsafe actuator
Actuator
Failsafe binary output module
with indirect driving of a
failsafe actuator via
24 V contactor/relay contacts (one
source output, one sink
Actuator
output)
In special cases, coupling
0 V
relays must be designed for
diversity
See Table 18-6
Comments Modules
1×DQ Onboard I/O
2×F DIs 6ES5 431-8FA11
or
1×DQ Onboard I/O
2×F DIs Onboard I/Os
All standard DQ modules
from the S5-100U series
2×F DQs 6ES5 450-8FA11
or
2×F DQs Onboard I/Os
2×F DQs Onboard I/Os
or
2×F DQs 6ES5 450-8FA11
EWA 4NEB 812 6210-02
S5-95F