Omron SYSMAC CS Series Operation Manual page 57

CS1W-PTS02 Isolated-type Resistance Thermometer Input Unit
Item
Unit numbers
Areas for data CIO Area words
exchange with allocated for
CPU Unit Special I/O Units
DM Area words
allocated for
Special I/O Units
Number of temperature sensor
inputs
Temperature sensor types
Input ranges
Scaling in industrial units
Data storage in the CIO Area
Accuracy
Temperature coefficient
Resolution
Sensing method
Allowable lead wire resistance
Input detection current
Response time
Conversion period
Maximum time to store data in
CPU Unit
44
00 to 95 (Cannot duplicate Special I/O Unit numbers.)
10 words/Unit
Resistance Thermometer Input Unit to CPU Unit:
All process values, process value alarms (LL, L, H, HH), rate-of-change values, rate-
of-change alarms (L, H), disconnection alarms, cold junction sensor errors
100 words/Unit
CPU Unit to Resistance Thermometer:
Temperature sensor type, input range (user set), scaling of process value data to be
stored in allocated words in CIO area, number of items for moving average, process
value alarm setting (LL, L, H, HH), rate-of-change alarm setting (L, H), zero/span
adjustment value, etc.
4
Pt100 (JIS, IEC) or JPt100
The input range can be set within any of
the measurable input ranges shown in
Table 1 (below).
Note Internally, inputs are processed in
five ranges (refer to Table 2 below),
so accuracy and resolution accord
with these internal ranges.
Data to be stored in the allocated words in
the CIO area must be scaled (with the
minimum and maximum values set). Data
can be stored at 0% to 100%.
The value derived from carrying out the following processing in order of the actual
process data in the input range is stored in four digits hexadecimal (binary values) in
the allocated words in the CIO Area.
1) Mean value processing → 2) Scaling → 3) Zero/span adjustment → 4) Output lim-
its
The greater of the following:±0.1% (of internal range full span) or 0.1°C
As shown in the following equation, the accuracy depends on the ratio of the selected
internal range (0 to 4) span to the set input range span.
Accuracy = ±0.1% x
±0.015% /°C, for any of internal range numbers 0 to 4.
1/4096 (of internal range full span)
As shown in the following equation, the resolution depends on the ratio of the selected
internal range (0 to 4) span to the set input range span.
1
Resolution = x
4096
3-wire method
20 Ω max. per wire
0.25 mA
0.5 s (travel time from input 0% to 90%, for step input)
100 ms/4 inputs
Conversion period + one CPU Unit cycle
Specifications
Sensor type, input range, and scaling to
industrial units are separate for each of
the 4 inputs.
Note Sensor type, input range, and scal-
ing to industrial units are set in the
DM Area.
Example:
Sensor type: Pt100; input range: 0 to
500°C; industrial unit scaling: 0.0 to
500°C. DM Area settings are as follows:
Sensor type: 0 (0000 Hex)
Input signal maximum: 5000 (1388 Hex)
Input signal minimum: 0 (0000 Hex)
Industrial unit maximum value stored: 500
(01F4 Hex)
Industrial unit minimum value stored: 0
(0000 Hex)
Internal range span
or 0.1°C, whichever is greater.
Set input range span
Internal range span
Set input range span
Section 2-2