CDX800 DESCRIPTION
3. CIO - analogue inputs and binary outputs
3.1. Introduction
CDX 800 is equipped with a user interface (I/O) for scanning and processing of
analogue signals and for controlling (setting) of binary signals. The user can use five
adjustable inputs outputs, which are placed on the I/O connector at the back panel of the
module. More about CIO 2 modules see
[4]
.
3.2. Description of I/O signal evaluation and reception
On the input/output, there are five signals, which can be processed and controlled by
settings of the CIO 2 module. It is possible to control these signals remotely or to send their
values in the data form to a remote location of a data network.
3.2.1.
Analogue input
Every 100 msec, the voltage value of the analogue input is read, converted to a digital
decabit value and adjusted by the calibration constant. The value is further average computed
according to user setting and saved in the computer memory. The basic range of the input
voltage is 0 to 5V.
3.2.2.
Binary output
Binary output is implemented by a transistor with open collector connected to I/O
signal. When inactive (log 0), the transistor does not conduct and acts like an opened switch.
When active (log 1), the transistor acts like a switch connecting the I/O signal to the ground
(GND). In both cases, the I/O value is measured as an analogue input too. The status of the
switched circuit is being checked this way.
3.2.3.
I/O signals inside CDX 800
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