FP2 Analog Unit
Procedure for Handling Analog Unit
7 - 4
7.2
Reading the Analog Input Data
7.2
Reading the Analog Input Data
During sequence program processing with the FP2, the analog input data is allocated
to the general input (X) and refreshed. In other words, the analog input conversion data
is automatically refreshed and stored from the analog input circuit to the FP2 input relay
area.
When the analog input conversion data is processed at the sequence program, refer to
the allocated input relay area (WX) data.
For detailed information
section 4.2
Precautions regarding the analog input data reading
The time from the end of startup of the FP2 to the setting of the first analog input data
of the conversion processing to the readable area of FP2 CPU unit on the analog input
circuit differs depending on the analog input range and is given in the table below.
Input range
CPU unit with analog I/O
(FP2-C1A)
Analog input unit (FP2-AD8)
Voltage input range
460ms
430ms
Current input range
460ms
430ms
Thermocouple input
range
910ms
1330ms
R.T.D. (Resistance
thermometer device)
input range
3350ms
6490ms
Until the first conversion data is set, the analog input data of the area is zero (K0).
Perform the processing by taking into consideration the time until the first conversion
data is set during the analog input conversion data processing of the sequence program.
To ascertain the timing of how the first conversion is set, use the preparation completion
flags of the shared memory.
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Содержание FP2 -C1A
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