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Technical equipment of TC600 PLC
25
TXV 138 08.02
5.1.5
Analog Inputs of the TC634 Module
Analog inputs serve for connection of up to eight analog signals of the
controlled object to the PLC. They are intended especially for measurement
of temperatures using passive resistance temperature scanners, and for
processing of analog signals with normalized current or voltage level. Input
circuits are galvanically connected with the PLC internal control circuits.
Inputs are fixed-configured as differential ones. Every input can be set
individually using a jumper for direct-current voltage or current signal
source. Measurement range and format of the input variable value are set in
a program. Input type, measurement range and format of the value of input
data can be selected for every input independently of other inputs.
To supply power to passive resistance detectors, an internal power sup-
ply providing specific current 1 mA is available, which is switched in meas-
urements automatically to one of the two output clips.
The module ensures filtering off of the disturbance component of input
signals, protection of input circuits, conversion of the analog voltage or cur-
rent input level to the binary value, and conversion of the value into the
chosen format.
Number of input channels
8
Arrangement of inputs
8 differential
Method of A/D conversion
sigma-delta modulation
Input filtration
digital filter 50 Hz
Calibration
automatic at the PLC initialization
and at every change of the measure-
ment range
Conversion time of one channel
60 ms
Reconfiguration time of one channel
1)
180 ms
Total measurement time
2)
variable according to configuration
Input response time
3)
60 ms
Binary representation of the input
16 bits
Galvanic separation from internal
electric circuits
no
Galvanic separation from non-live
PLC parts
yes
Input type
(can be selected by a jumper)
current
voltage
voltage - passive resistance scanners of
temperature
1)
Reconfiguration time of one channel is time necessary to change and
calibrate the measurement range and conversion of one channel. It is
applied at transferring among different input types.
2)
Total measurement time is the sum of times necessary for conversion or
reconfiguration of all declared input channels
3)
Response time of the input is time which the input signal needs to reach
100% of its final value. If the signal change is faster than the response
time of the input, the signal is reduced by the input filter.
Switching of the
current source allows
for connection of two
detector strings with
impedance up to 8 k
Parameters of analog
inputs of TC634