4
Operating instructions
Safety-monitoring module
AES 1235
AES 1236
EN
AES 1235/1236
Guard door monitoring by means of position switches with safety
function
AES 1235
14
L1
A1
10
0
m
A
S13
K1
K3
A2
max.
Y1
X1
K4
3
K2
S14
S21
S22
13
N
M
23
24
A1
A2
Y2
X2
+24 VDC
0 V
A
B
AES 1235/1236
Guard door monitoring by means of a magnetic safety sensor (BNS)
AES 1235
14
L1
A1
10
0
m
A
S13
K1
K3
A2
max.
Y1
X1
K4
3
K2
S14
S21
S22
13
N
M
23
24
A1
A2
Y2
X2
+24 VDC
0 V
A
Legend
A
Positive break
A
S
Non-contact safety sensor
A + B
Safety switch
H
Start button
8.2 Integral System Diagnostics (ISD)
The safety monitoring modules LED display to show the different
switching conditions and faults. The following tables show the different
switching conditions.
Tables switching condition indication
Diagnostic LED
System condition
The LED is green.
Enabling paths closed
LED flashes yellow
(0.5 Hz)
Enabling paths open
LED flashes yellow
(2 Hz)
Safety guard closed, however no authorised
operation; possible cause: incorrect operation
(only one contact was actuated when the
safety guard was opened) or voltage drop
or feedback loop not closed → perform
start-up test
Table error indications
Indication
(orange) LED
Error
Cause
1 impulse
Switch
Defective supply
voltage lead, defective
switch, erroneous
fitting of the switch;
switch only partially ac-
tuated* for at least 5 s
4 impulses
Interference signals
at the inputs (no
safe evaluation
assured)
Too high capacitive or
inductive interference
at the switch's cables
or the supply voltage
lead
5 impulses
One or both relays
did not close within
the monitoring time
Too low operating
voltage U
e;
Defective relay
6 impulses
Relay not disabled
upon the actuation
of the switch
May be due to contact
welding
7 impulses
Dynamic monitoring
of both channels
(cross-monitoring)
failure
Fault in one channel;
internal data trans-
mission interrupted
* Partial actuation: position of the switch, in which only one contact was actuated.
Deleting the error message
The error message is deleted once the fault has been rectified and after
the connected switch has been actuated to check the various functions
(open and then close the safety guard).
