Chapter 6. BUFFER MEMORY CONFIGURATION AND FUNCTIONS
6 - 4
6.2.3 Detected Temperature Value
(G3F-RD2A : Addresses 9, 12, 15, 18, 24, 27 and 30, G4F-RD2A : Addresses 5, 8, 11 and 14)
1) This area performs sampling processing of the temperature value that is input through the RTD
connected to the terminal block of a channel and stores the value of 10 times of the real temperature
value.
REMARK
If a real temperature is 123.4
°
C the stored value is 1234. But, 123.4 is displayed on the G3F -RD3A
LED display
2) The followings show the configuration of each address.
3) If the temperature conversion specification of a channel is changed from enable into disable the
detected temperature value before the change remains.
6.2.4 Digital Conversion Value
(G3F-RD3A : Address 10, 13, 16, 19, 22, 25, 28 and 31, G4F-RD2A : Address 6, 9, 12 and 15)
1) A temperature value that is input through the RTD connected to the terminal block of a channel is
represented as a value between -2000 to 6000 and then the converted value is stored. The converted
value stored is called digital conversion value.
2) A digital conversion value that has been converted into a value between 0 to 16000 can be directly
used as a process value of the PID control module.
3) The digital conversion value and the detected temperature value have the following arithmetic relation.
Digital conversion value = (Detected temperature value + 2000)
X
2
REMARK
If a real temperature is 123.4
°
C, then the detected temperature value is 1234 and the digital
conversion value is 6468 since the item of the detected temperature value in the expression
(Detected temperature value + 2000)
x 2
should be replaced with 1234.
4) If the temperature conversion specification of a channel is changed from enable into disable the digital
conversion value before the change remains.
6.2.5 Error Code
(G3F-RD3A : Addresses 11,14, 17, 20, 23, 26, 29 and 32, G4F-RD2A : Addresses 7, 10, 13 and 16)
1) Disconnection that can occur between the RTD and the RTD input module is detected by its type, and
also error information is stored when the detected temperature is outside range(-200.0 to 600.0
°
C)
2) The following shows the types of error code.
Error Code
(Decimal)
Error Description
Data processing at error occurrence
RUN LED
status
16
A disconnection detected
17
B disconnection detected
18
B disconnection detected, A and B
disconnection simultaneously
detected
19
Temperature outside range
Detected temperature value and digital
conversion value before error
occurrence remains
Flickering with
0.1 sec.
3) If two or more disconnection is detected the priority order is 18, 17 or 18, 16. If A disconnection and B
disconnection occur simultaneously error code is 18.
6.2.6 Specifying SET Data (G3F-RD3A : Address 33, G4F-RD2A : Address 17)