Digital I/O Ports - Control Techniques UD70 User Manual

8.13

Digital I/O ports

The has two digital inputs and one digital output as standard. These
UD70
inputs and output are
9-way
RS485
Pin
1
2
3
4
5
6
7
8
9
The digital
In addition, they are also directly readable by a DPL program.
The digital
The following virtual parameters give access to the
Parameter
#86.01
#86.02
#86.03
The inputs read 0 0 when at logic high (5V or unconnected), and 1 1 when at
logic low (0V).
The output is at logic high (5V) when 0 0 is written.
The digital output is rated at a maximum of 15 milliamps
(sink/source).
Connections to the digital inputs and outputs should be
Warning
kept as short as possible (0.5 metre (20 in) maximum
recommended). External buffering is required if longer
cable lengths are used, or interfacing is needed to
different logic levels.
8-36 Features
logic (ie. 5V logic), and are made available on the
TTL
port connector, as follows:
Description
RS485 isolated 0V
RS485 /TX
RS485 /RX
DIGIN0 (TTL digital input 0)
DIGIN1 (TTL digital input 1)
RS485 TX
RS485 RX
TTL digital output
Drive 0V
inputs are used in conjunction with the timer/counter unit.
TTL
output can also be controlled directly from a DPL program.
TTL
Function
Digital input 0 (DIGIN0)
Digital input 1 (DIGIN1)
Digital output
I/O:
TTL
UD70
Issue code: 70nu2