4
Operating instructions
Safety-monitoring module
AES 2155/2156
AES 2165/2166
EN
AES 2155/56
A1
A2
S13
S14
S21
S22
13
L1
24VDC
K1
K2
S1
S2
S13
S14
S21
S22
X5
X6
14
K3
K4
U
e
3
M
AES 2155/2156
AES 2165/66
AES 2165/2166
A1
A2
S13
S14
S21
S22
13
BK
BK
BU
BU
BN
BN
WH
WH
S13
3
S14
S21
S22
14
24VDC
M
S1
S2
X5
X6
U
e
K4
K3
L1
K1
K2
N
Legend
A
Positive break
A - D
Safety switch
S
Non-contact safety sensor
8.2 Integral System Diagnostics (ISD)
The LED indication of the safety-monitoring modules shows the different
switching conditions and errors. The switching conditions are explained
in the following tables.
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
release; possible causes: incorrect
operation (only one contact actuated
upon opening) or voltage drop
→ perform start-up test
The safety-monitoring modules have two more LED indications. The
yellow LED is intermittently on. The switching conditions are explained
in the following tables.
Indication (yellow) LED
System condition
1 impulse
Safety guard 1 open
2 impulses
Safety guard 2 open
Table error indications
Indication (orange) LED Error
Cause
1 impulse
Inputs S1
Defective supply voltage
lead, defective switch,
erroneous fitting of
the switch; switch only
partially actuated* for at
least 5 s
2 impulses
Inputs S2
refer to errors inputs S1
3 impulses
Inputs S1 and S2
refer to errors inputs S1
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
Relay contact welding
7 impulses
Dynamic monitoring
of both channels
(cross-monitoring)
failure
Fault in one channel;
internal data transmis-
sion interrupted
* Partial actuation: position of the switch, in which only one contact was actuated.
Deleting the error message
The error message is deleted, when the error cause is eliminated
and the AES can check all functions. In case of an error of switch 1
or switch 2, actuate the switch concerned (open the safety guard and
close it again). For all other errors, both switches must be actuated.
