User manual

512/612 Modicon Micro PLCs
44
890 USE 145 00
Installation Guidelines
The Model 512 and 612 PLCs offer a
straightforward plug-and-play installation
capability.
Mounting Options
A PLC (or a PLC-based I/O expansion
link) may be mounted:
In a NEMA cabinet
On a wall
On an EIA rack
On DIN rail
Note If The PLC uses its A120
I/O expansion capability, the unit
and its associated A120 I/O
racks must be mounted on DIN
rail.
Securing a Unit to a Flat Surface
The PLC housing contains four through-
holes—two at the top and two at the
bottom—to secure the unit to a flat sur-
face such as a
1
/
4
in metal plate in a
NEMA cabinet.
To access these through-holes, remove
the I/O terminal blocks at the top and
bottom of the unit. The through-hole
locations are shown in the dimension
drawing below.
The four holes are counter-bored in the
housing so that the securing screws will
not touch the terminal blocks when they
are re-inserted onto the unit.
Use M5 screws. The type and length of
the screw depends on the kind of
surface on which the units are being
mounted—e.g., a machine screw with a
minimum length of
5
/
8
in should be used
to mount to a
1
/
4
in plate.
254.00 mm (10 in)
198.00 mm (7.8 in)
56.00 mm
(2.20 in)
9.125 mm
(0.359 in)
PLC
base
base +
terminal
blocks
17.75 mm
(.698 in)
158.75 mm
(6.25 in)
132.375 mm
(5.21 in)
141.5 mm
(5.57 in)
123.5 mm
(4.86 in)