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OMRON Scientific Technologies Inc.
© OMRON STI 0613 PN99804-0060 Rev. B
32
1 0 . 1 C
O NN EC T I NG
T O
A
S
AF ET Y
M
O N IT O RI NG
D
EVI CE
The wiring from the MS4800 system to the machine control circuit must be control reliable as
described in ANSI B11.19-2003. Normally PLCs are not designed to be control reliable. Safety
devices such as the MS4800 system should not depend on a PLC to stop a guarded machine.
However, safety related monitoring devices are now available. See
Figure 10-1
for connection to such
a device. Note that all safety inputs are directed to the monitoring device which also performs the
EDM monitoring function.
Figure 10-1 Connecting to a Safety Monitoring Device
+24VDC 0 VDC
Earth
Ground
Power Supply
OSSD 1
OSSD 2
0 VDC
+24VDC
MS4800 Receiver
MS4800 Transmitter
Brown
Input 1
Input 2
Safety
Mats
Input
Safety
Interlock
Input
Other
Safety
Devices
Safety
Monitoring
Device
ED
ED
Suppressor
2
2
1
2
3
Blue
EDM1
EDM 2
3
3
1
Earth
White
Black
0 VDC
+24VDC
Earth
Blue
White
Green
Output 1
Output 2
Machine Control Contacts
ED1
ED2
The Safety Monitoring Device must monitor
the NC contacts of the external devices.
V
erify that the final switching devices are
properly suppressed.
User -supplied fuse
Green
N/C
N/C
Black
Brown
4
Receiver & Transmitter connections shown
with cable MS4800-CBLTX-10M
4
4
Suppressor
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