Installation manual
Page 71 of204
4.3.4.3 Overview of achievable PI for digital safety outputs
Output
PSCBR
Actuator /
external shut-
down circuit
Catego
ry acc.
to
EN138
49-1
DC
MTTF
D
Actuat
or
Achie
vable
PI acc.
to EN
ISO
13849-
1
Boundary
conditions
Fault
exclusion
Single-
channel
without
dynamic
output test
Rel 1 or 2
DO 0P, DO
0M, DO 1P,
DO 1M
EAA1..EAA40
Single-channel
Contactor, valve,
brake, etc.
without direct
feedback for
diagnostics.
Cat. B
0 %
Medium
b
Contactor and
downstream actuators
appropriately designed
for safety application
Single-channel
Contactor, valve,
brake, etc. with
monitored and
positively guided
auxiliary contact
Cat. 2
60-
90 %
Dependin
g on
switching
frequenc
y
Medium
b
Message output required
for warning in case of
detected malfunction
Contactor and
downstream actuators
appropriately designed
for safety application
High
c
As before
d
As before DC = 90 %
due to a sufficiently high
test rate with reference
to the application
Single-
channel
without
dynamic
output test
Rel 1 or 2
or
Single-
channel
DO 0P, DO
0M, DO 1P,
DO 1M
Dual channel
Contactor, valve,
brake, etc. with
direct feedback
for diagnostics
at least in one
channel or
actuator single-
channel
controlled with
safety function
cat. 3 (e.g. STO)
Cat. 2
90 %
Monitorin
g only in
an
external
shut-
down
circuit
Medium
c
Message output required
for warning in case of
detected malfunction
Contactor and
downstream actuators
appropriately designed
for safety application
Short circuit
on external
control
High
d
Single-
channel
without
dynamic
output test
EAA1..EAA40
Dual channel
Contactor, valve,
brake, etc. with
direct feedback
for diagnostics
at least in one
channel or
actuator single-
channel
controlled with
safety function
cat. 3 (e.g. STO)
Cat. 3
90 %
Monitorin
g only in
an
external
shut-
down
circuit
Medium
or High
d
Contactor and
downstream actuators
appropriately designed
for safety application
Short circuit
on external
control
Single-
channel with
dynamic
output test
EAA1..EAA40
Dual channel
Contactor, valve,
brake, etc. with
direct feedback
for diagnostics
at least in one
channel or
actuator with
safety function
cat. 4 (e.g. STO)
Cat. 4
99 %
Monitorin
g in both
external
shut-
down
circuits
High
e
Contactor and
downstream actuators
appropriately designed
for safety application
Monitoring of electro-
mechanical components
by means of positively
guided switches, position
monitoring of control
valves, etc.
Summary of Contents for PSCBR-C-10 Series
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