Rockwell Automation 442L SC300 Safety Sensor User Manual - Manual (Page 32)

30 Rockwell Automation Publication 10000202762 Ver 00 - January 2012
Chapter 5 Electrical installation
External device monitoring (EDM)
You must implement the external device monitoring electrically as follows: When the
contact elements (K1, K2) reach their de-energized position after the protective device
has responded, the two positively guided N/C contacts (k1, k2) must close. 24V is then
applied at the input of the EDM. If 24V is not present after the response of the protective
device, then one of the contact elements is faulty and the external device monitoring
prevents the machine starting up again.
The configuration of the external device monitoring is described on page 42.
External key-operated pushbutton for teach-in
To permit remote teach-in and/or to protect the configuration, you can connect an
external key-operated pushbutton for teach-in and lock the internal teach-in key.
Notes • Once the key-operated pushbutton for teach-in has been operated, the SC300 locks
the internal teach-in key and saves this configuration in the device. Teach-in can only
be performed using the external key-operated pushbutton for teach-in (see “Locking
the internal teach-in key” on page 43).
• If you use two SC300 in an application, then both systems use the same external key-
operated pushbutton for teach-in (see Figure 23).
Two SC300 with synchronization
Figure 23 - Connection of two SC300 with synchronization
If two SC300 are so arranged that they entirely or partially look at the same reflective
tape, the two cameras may interfere with each other. To guard against this situation
occurring, you must synchronize the two cameras.
How to synchronize two SC300:
Connect pin 3 on the two cameras together. The cameras will synchronize automatically
each time after switch on and after every teach-in procedure.
Notes • If you actuate the external key-operated pushbutton for teach-in or one of the two
internal teach-in keys, both devices will learn their protective fields at the same time.
Perform a teach-in procedure after any change to the
connection.
The SC300 activates the external device monitoring only after
the next teach-in procedure. If you place the system in operation
after connecting the contacts to the external device monitoring
(EDM) input without teach-in, then the external device
monitoring will remain deactivated. The system can therefore
switch to green despite faulty contactors.
ATTENTION
+24V
0V
1
2
3
4
5
6
7
8
Internal
teach-in
key
RESTART
+24V
TEACH/SYNC
EDM
OSSD1
OSSD2
GND
FE
K1 K2
k1
k2 Internal
teach-in
key
1
2
3
4
5
6
7
8
Key-
operated
pushbutton
for teach-in
k3
k4
K4 K3