Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 22)

Preface MicroLogix 1000 Programmable Controllers User Manual
1–6
The following illustrations show the Master Control Relay wired in a grounded
system.
Note The illustrations only show output circuits with MCR protection. In most
applications input circuits do not require MCR protection; however, if you need to
remove power from all field devices, you must include MCR contacts in series with
input power wiring.
Schematic (Using IEC Symbols)
X1 230V ac
230V ac
Disconnect
L1 L2
Isolation
Transformer Operation of either of these contacts will
remove power from the adapter external I/O
circuits, stopping machine motion.
MCR
MCR
MCR
Emergency-Stop
Push Button
Overtravel
Limit Switch Stop
Start
Suppr.
MCR
(Lo) (Hi)
Line Terminals: Connect to 230V ac
terminals of Power Supply.
dc Power Supply.
Use IEC 950/EN 60950
MCR
+ —
X2
Line terminals: Connect to 24V dc
terminals of Power Supply.
24V dc
I/O Circuits
230V ac
I/O Circuits
230V ac
I/O Circuits
Master Control Relay (MCR)
Cat. No. 700-PK400A1
Fuse
Fuse
Suppressor
Cat. No. 700-N24