2
Rockwell Automation Publication 440J-IN001B-EN-P - June 2016
440J-N Enabling Switch
Example of Wiring Diagram
Realizing Safety Category 4
Three Position Switch, Manual Reset, Monitored Output
The external wiring is performed according to the protection measures
against contact of dangerous potentials, such as double isolation or
ground wire connection.
One example of the circuit; safety relay module, MSR127RP
manufactured by Allen-Bradley® Guardmaster®.
Note: Use the monitoring device (safety relay module) providing it has
the capacity to detect a cross short circuit. Wire the channels 1 and 2 of
three-position switch as shown in the diagrams.
Electromechanical switches must be wired with the control unit, that
the requirements from DIN EN 775, DIN EN 60204-1, DIN EN 954-
1, DIN EN 1088, and VDI 2854 are fulfilled. Two stage
electromechanical switches are only allowed in combination with an E-
stop unit.
Contact Operation
S11
S12
S52
S22
S21
S34
A2
A1
MSR127RP
L1
N
14
24
13
33
23
41
L1
K1
L2
K2
L3
34
42
K1
K2
M
3
1 2
(+)
1
2
3
4
(-)
3-position switch
Reset
(+)
(-)
Twin screened and sheathed cable
3-Position Enabling Switch
(-)
(+)
3
1
4
2
IMPORTANT
Terminals 1-2, 3-4 and 5-6 (440J-N21TNPM and
440J-21TNPM-NP) or 1-2, 3-4 (440J-N2NTNPM-NE) are
positive opening when the switch operates from
position 2-3.
Use contacts of terminals 1-2 and 3-4 for the output of the
enabling system.
The characteristics illustrate the performance when the
center of the yellow button is pressed. Pressing the edge
activates one of the two three-position switches inside earlier
than the other, and causes a delay in the operation of the grip
switch.
440J-N2NTNPM-NE
1-2
3-4
Emergency stop pushbutton switch: 2 N.C. contacts (Terminal 5-6 and 7-8)
1-2
3-4
Push
Push
440J-N21TNPM
1-2
5-6
3-4
Position 1
Terminal
No.
Position 2
Position 3
Release
Release
1-2
5-6
3-4
4.2
+
=
=
Pushbutton switch: 1 N.O. contact (Terminal 7-8)
Push
440J-N21TNPM-NP
1-2
5-6
3-4
Release
1-2
5-6
3-4
+
7.0
4.2
7.0
4.2
7.0
