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Instruction Manual
IM-106-4050 Original Issue
March 2006
5-6
OxyBalance Oxygen Display
and Averaging System
MICROLOGIX 1200
PROGRAMMABLE
CONTROLLERS
The MicroLogix 1200 Programmable Controllers consist of one PLC unit and
three I/O modules. The PLC mounts horizontally with the expansion I/O
modules extending to the right of the controller.
PLC Removal
NOTE
Make sure to carefully record the wiring connections and locations before
disconnecting. This will aid in the installation of the unit.
1. Tag and disconnect all wiring from the MicroLogix PLC.
2. Remove the cover from the ribbon cable connector on the PLC. Use the
pull loop on the connector to disconnect the ribbon cable from the PLC.
Do not pull on the ribbon cable. See Figure 5-4.
3. Place a flat-blade screw driver in the DIN rail tab at the bottom of the
controller, see Figure 5-5. Holding the PLC, pry downward on the tab
until the tab locks in the open position.
4. Repeat step 3 for the second DIN rail tab.
5. Pull the bottom of the PLC out and away from DIN Rail, as shown in
Figure 5-6. When the bottom of the PLC is free from the DIN rail, lift up
on the PLC until the top is also free of the DIN rail. Remove the PLC
from the OxyBalance enclosure.
This equipment is intended for use in clean, dry environments where only non-conductive
pollution occurs (except occasionally a temporary conductivity caused by condensation),
and with circuits not exceeding Over Voltage Category II (IEC 60664-1).
Electrostatic discharge can damage semiconductor devices inside the controller. Do not
touch connector pins and other sensitive areas.
Disconnect all power before installing or replacing components. Failure to disconnect power
may result in electrical shock and/or damage to the equipment.