Conel CDA 70, Руководство пользователя

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CIO DESCRIPTION
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3. CIO - analogue inputs and binary outputs
3.1. Introduction
CDA70 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. It is possible
to use INAC (INAC) signal on the supply connector for checking the presence of DC voltage
for power source (can be functional only if there is accumulator supply backup). Output binary
signal PWRSV is linked on the same connector (open collector) for automatic disconnection of
the whole device from supply voltage. The signal can be used for applications where
minimizing of electric power input is crucial. Internal analogue values accessible to the user
are also included in the concept of external signal processing and control. These are
represented by values of direct supply voltage on the CDA70 (UN+) input and temperature
inside the module (TEP).
3.2. Description of multi-purpose signal evaluation and reception
On the input/output, there are five signals, which can be processed and controlled by
settings of the CIO 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.
Each of the five signals can be configured as an analogue input, binary input or binary
output. All five signals may also be set individually as necessary. Some signals can be input
and other can be output at the same time.
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.
Following a signal change by a value bigger than the default hysteresis, a change
event is generated. The change under defined module settings generates report on values of
all active signals and sends it to the defined destination.
Even if the input signal is analogue-processed, it has a binary interpretation saved in
the memory. This is created by comparing the signal value to the control level set. At CIO data
reception, both analogue and binary values of active signals are saved to the report. It is
possible to set CIO parameters in order that the resulting binary value is inverted.
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.