Siemens IK PI · 2004
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AS-Interface Slaves
Earth fault detection modules
Modules with special functions
6
■
Overview
"... Earth faults in control circuits should neither lead to uninten-
tional start-up nor to dangerous motion of a machine and they
must not hinder shutdown of the machine (EN 60204, Part 1 or
DIN VDE 0113)".
The AS-Interface earth-fault detection module has been devel-
oped to ensure that these requirements can be met more easily
in the future. This module from the SlimLine Series allows earth
faults in AS-Interface installations to be reliably detected and re-
ported.
The following earth faults are detected:
• Earth fault in AS-i "+"
• Earth fault in AS-i "-"
• Earth fault in sensors and actuators that are supplied from the
AS-Interface voltage
In each case, only one module is necessary for each AS-Inter-
face network.
■
Function
The earth fault is detected by the module, indicated via a LED
and signaled via two signaling outputs (1 = no earth fault /OK;
2 = earth fault/fault. The earth fault alarm is stored in the module.
The module can only be reset after the earth fault has been rec-
tified by switching off the AS-Interface voltage via a reset button
or via a high signal on the floating remote-reset input. The reset
button can also be used for checking correct functioning of the
module. External auxiliary voltages are not monitored for earth
faults by this module.
Note: The earth fault detection module is a passive module with-
out an IC. Therefore it does not require an individual address in
the AS-Interface network.
Typical connections
N
S
A
0
_
0
0
0
9
0
a
P E
P E
5 k 6
5 k 6
2 4 V
1 / A S - i -
4 / A S - i +
2 /
3 / T
3 / R
R E S
6 / -
7 / L 2 4 +
8 / O K
9 / F A U L T
1 2 / M 2 4
1 1 / M 2 4
1 0 / M 2 4
+
+
+
R E S
R E S
+
1 / A S - i -
4 / A S - i +
-
R - R E S
O . K .
F A U L T
A S - i
T E S T /
R E S E T
M 2 4
M 2 4
M 2 4
L 2 4 +
O . K . F A U L T
A S - i -
T
A S - i +
R - R E S
-
-
-
-
R
R
O . K .
O . K .
F A U L T
F A U L T
A l t e r n a t i v e l y
A u t o m a t i c t e s t
P L C
P L C
I n p u t
I n p u t
I n p u t
I n p u t
O u t p u t
P L C
O u t p u t
O u t p u t
A S - i f a u l t
O u t p u t
A S - i f a u l t
P L C
A S - i c o n n e c t i o n
C o n n e c t i o n f o r s y s t e m e a r t h
C o n n e c t i o n f o r s y s t e m e a r t h ( f o r t e s t f u n c t i o n )
A s - i + c o n n e c t i o n
R e m o t e r e s e t i n p u t ( R - R E S )
R e m o t e r e s e t g r o u n d ( )
E x t e r n a l v o l t a g e s u p p l y f o r s i g n a l i n g o u t p u t s L 2 4 +
S i g n a l i n g o u t p u t O . K .
S i g n a l i n g o u t p u t F A U L T ( e a r t h f a u l t s i g n a l i n g )
E x t e r n a l v o l t a g e s u p p l y f o r s i g n a l i n g o u t p u t s M 2 4
N e g a t i v e c o n n e c t i o n f o r s i g n a l i n g o u t p u t M 2 4
N e g a t i v e c o n n e c t i o n f o r s i g n a l i n g o u t p u t M 2 4
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
T e r m i n a l
D e s i g n a t i o n
