SEW-Eurodrive MOVISAFE DCS B Series

140
Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
12
Diagnostic values
Appendix
12.4.6 Encoder values of MOVIDRIVE
®
B via backplane bus
12.5 Diagnostic values
The diagnostic values specify the DC value that can be assumed for calculating the
performance level.
12.5.1 Binary inputs
General assessment of the diagnostics coverage (DC) for binary inputs according to EN ISO 13849-1.
Type designation Supply voltage Output signal
Backplane bus inc. - 4096 increments/revolution
Backplane bus abs. - Max. 2
31
− 1 increments
INFORMATION
• Refer to the manufacturer's specifications (MTTF
d
, FIT numbers, etc.) for the
safety-relevant evaluation of the sensor subsystem.
• The DC values listed in the table should be applied conservatively to ensure
compliance with the boundary conditions ("Comment" column).
• Fault exclusions are permitted according to the relevant standards. The specified
boundary conditions must be permanently ensured.
• If several sensor systems are required for an individual safety function to work
properly, their partial value must be combined correctly according to the selected
method.
Measure DC
value
Comment Use
Cyclical test pulse by changing the
input signals dynamically.
90% Only effective if pulse
assignment is active.
Cross fault monitoring for
single-channel sensors.
Cross comparison of input signals
with dynamic test if short circuits
cannot be detected (with multiple
inputs/outputs).
90% Cyclical change of input
signals required, for
example by regular
acknowledgement.
Monitoring of dual-channel
sensors.
Cross comparison of input signals
and intermediate results in the
logic (L) and temporal monitoring
of the logical program run as well
as detection of static failures and
short circuits (with multiple
inputs/outputs).
99% Cyclical change of input
signals required, for
example by regular
acknowledgement.
Monitoring of dual-channel
sensors.
Plausibility check, for example
using the NO and NC contacts of
positively-driven relays.
99% Only effective in conjunc-
tion with active monitoring
function for input element
(EMU function).
Monitoring of dual-channel,
complementary sensors.