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12
Input Types and Data Conversion
Section 2-2
Note
1.
Input signal ranges can be set for each input.
2.
Use the analog input voltage/current value within the specified input signal-
range. Exceeding the specified range may result in malfunction.
3.
A/D conversion time is the time it takes for an analog signal to be stored in
memory as converted data after it has been input. It takes at least one cy-
cle before the converted data is read by the CPU Unit.
Input Conversion and Alarm Output Functions
Note
Sensor error detection is effective only when the input type is set to thermo-
couple input, platinum resistance thermometer input, 1 to 5 V input, or 4 to
20 mA input. The Sensor Error Flag will be turned ON if there is no input sig-
nal from the thermocouple input, platinum resistance thermometer input, 1 to
5 V input, or 4 to 20 mA input.
2-2
Input Types and Data Conversion
In addition to voltage and current inputs, the temperature sensors listed below
can be connected directly to a Universal Input Unit.
Voltage and Current Inputs
Measurement method for
platinum resistance ther-
mometer inputs
3-wire method
Allowable lead wire
resistance
20
Ω
max. per wire
Items
Specifications
Item
Specifications
Process value alarms
Two alarms (high and low) with hysteresis. The alarms
can be set separately for each input.
ON-delay timer
0 to 60 s, independently settable for each input
Scaling
(Voltage and current
inputs)
Any industrial units can be set by setting the upper and
lower limits in the range of
−
32,000 to 32,000. These lim-
its are converted as full scale.
Each input can be set independently.
Zero/span adjustment
• Zero adjustment (offset) range:
±
9,999 (LSB)
• Span adjustment (gain) range: 0 to 32,000 (
×
0.0001)
Each input can be set independently.
Sensor error detection
Detects sensor error at each input and turns ON the Sen-
sor Error Flag. (See note.)
Cold junction sensor
error
Detects errors in the cold junction sensor. and turns ON
the Cold Junction Sensor Error Flag.
Voltage/current input
DM Area setting
Voltage input (DC) 1 to 5 V
0050 (0032 hex)
0 to 5 V
0053 (0035 hex)
0 to 10 V
0054 (0036 hex)
Current input (DC) 4 to 20 mA 0048 (0030 hex)
0 to 20 mA 0049 (0031 hex)
Summary of Contents for SYSMAC CJ1W-AD04U
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