Reading The Detected Temperature Value Of The Module(Array Type); (G3F-Rd3A:rtd3Ard, G4F- Rd2A:rtd2Ard) - LG MASTER-K G4F-TC2A User Manual

Chapter 4. FUNCTION BLOCKS
4.2.2 Reading the Detected Temperature Value of the Module (Array Type)
(G3F-RD3A : RTD3ARD, G4F-RD2A : RTD2ARD)
The Array type temperature conversion value reading function block executes all channels of the RTD
input module in a batch processing. If a channel is enabled then the function block outputs the detected
temperature value and its digital conversion value that is usable as a PV in the PID control module.
Function
I/O
Block
I REQ
BASE
SLOT
CH
O DONE
STAT
ACT
ALM
ALM_
CODE
TEMP
SCAL
REMARK
Note 1: The numbers of Array are 8 in G3F-RD3A, 4 in G4F-RD2A
Data
Variable
Type
BOOL Function block execution request area
- Used to request an execution of the reading function block
- If the conditions connected with this area are established while the program is
running and "0" changes into "1", the reading function block is executed.
USINT Base location No.
- Used to write the number of the base where the RTD input module is loaded.
- Setting range: GM1 series(0~31), GM2 series(0~7), GM3/4 series(0-3)
USINT Slot location No.
- Used to write the number of the slot where the RTD input module is loaded.
- Setting range: 0~7
BOOL Run channel enable/disable specification
[Array] - Used to enable or disable a channeI for run.
*Note 1 - Specify "1" for enabling, and "0" for disabling
BOOL Function block execution complete status
- "1" is output when the reading function block is finished with no error and "1"
remains until next execution. If an error occur, '0' is displayed and the operation
enters into the stop state.
USINT Error status indication area
- Used to output the number of an error when it occurs during reading function
block execution.
- For description of errors, see GM Section 7.4
BOOL Run channel status indication area
[Array] - After the reading function block is finished with no error, "1" is output if the
*Note 1 channel is in normal state. But "0" is output for the disabled channels.
BOOL Run channel error indication area
[Array] - "1" is outputted when error occurs for each run channel.
*Note 1
USINT Run channel error code area
[Array] - Used to output the code of error occurred during run for each channel.
*Note 1 - For error description, see GM Section 7.4.
INT Detected temperature value output area
[Array]
- The CPU module reads the detected temperature value(-200.0°C to +600.0°C) of
*Note 1
the corresponding channel from the RTD input module and outputs it to this area.
- The detected temperature value of each channel is 10 times than the real
temperature value.
- (Example: Detected temperature value 1234 → real temperature value 123.4°C)
INT Digital conversion value output area
[Array] - The CPU module reads the digital conversion of the corresponding channel from
*Note 1 the RTD input module and outputs it to this area.
- The detected temperature value (-200.0°C to +600.0°C) of each channel is
converted into the a digital value within 0 to 16000 and it is output to this area.
- Value to be read from the output variable.
• SCAL =(the value to be read from the output variable TEMP + 2000) 2
• Example: Where a temperature is 234.5°C.
- The output value converted into a digital value can be used as the PV of the PID
control module.
Descriptions
The value to be read from the TEMP is (temperature 10), then
2345 is the detected temperature value.
The value to be read from the SCAL is (2345 + 2000) 2, i.e.,
8690.
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