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Vision™ OPLC™
Use separate wires to connect the functional
earth line (pin 3) and the 0V line (pin 2) to the
system earth ground.
Install an external circuit breaker. Guard against
short-circuiting in external wiring.
Double-check all wiring before turning on the
power supply.
Do not connect either the 'Neutral' or 'Line' signal
of the 110/220VAC to device's 0V pin.
In the event of voltage fluctuations or non-
conformity to voltage power supply specifications,
connect the device to a regulated power supply.
Earthing the OPLC
To maximize system performance, avoid electromagnetic interference by:
Mounting the controller on a metal panel.
Connect each common and ground connection directly to the earth ground of your system.
For ground wiring use the shortest and thickest possible wire.
Communication Port
Turn off power before making communications connections.
Signals are related to the controller's 0V; the same 0V is used by the power supply.
Always use the appropriate port adapters.
Caution
The serial port is not isolated. If the controller is used with a non-isolated external
device, avoid potential voltage that exceeds ± 10V.
Port 1 is type RJ-11 and may be set to either RS232 or RS485 via jumper as shown below.
Pinouts
The pinouts below show the PLC port signals.
RS232
Pin #
Description
1*
DTR signal
2
0V reference
3
TXD signal
4
RXD signal
5
0V reference
6*
DSR signal
*Standard programming cables do not provide connection points for pins 1 and 6.
**When a port is adapted to RS485, Pin 1 (DTR) is used for signal A, and Pin 6 (DSR) signal is
used for signal B.
Unitronics
RS485**
Pin #
Description
1
A signal (+)
2
(RS232 signal)
3
(RS232 signal)
4
(RS232 signal)
5
(RS232 signal)
6
B signal (-)
Controller Port
Pin #1
7
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