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11 External Device Monitoring (EDM)
EDM is an extra safety function. The function monitors the Focus II system interface to the guarded
machine and ensure that the control elements are responding correctly to the light barrier. It also detects
any inconsistency between the two external contactors, everything to detect a malfunction within the
interface which prevents a stop signal from reaching the machine controller. The connection for the EDM
is made at the receiver. On power-up, the Focus II system looks for a closed to +24VDC condition. If this is
found, it will enter a state consistent with the selected operating mode. When the Focus II system enables
its safety outputs, it monitors the external devices for a closed to open transition. This transition must occur
within 300 ms or the Focus II system will then enter an alarm state.
Additionally, if the EDM connections are incorrectly wired, the system will enter an alarm state. The EDM
function can be activated and deactivated using the selector switches on the receiver unit.
Wiring diagram:
K1 and K2 are standard contactors, KM1 and KM2 are NC contacts (force guided) of K1 and K2.
www.abb.com/lowvoltage
1
KM1 KM2
White
2
Brown
3
Green
4
Yellow
K1
5
Grey
6
Pink
7
Blue
8
Red
Screen
41
Test
Reset
+24VDC
OSSD 1
K2
OSSD 2
0V
Ground
2TLC172015M0201, rev. D
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