App.d-28 – Yokogawa GC8000 Process Gas Chromatograph User Manual
Page 473
<Appendix D Action of External Input and Output Signals>
App.D-28
IM 11B08A01-01E
● Retransmission
Upon receiving “Data retransmission request (#R)” during data transmission, the GC8000
sends the previous data again.
*1
*2
*2
DCS
#A
#R
#R
GC8000
#E
Data 1
Data 1
Data 1
*1: 3 seconds or less, *2: 0.04 seconds
<Timing for input command>
● Input command (normal)
While not sending data to DCS, the GC8000 sends “Input command prompt (#T)” at an
interval of 8 seconds. If the GC8000 does not receive an input command from DCS for 5
seconds after sending the prompt, the GC8000 waits for 3 seconds and then sends the
prompt to DCS again. The GC8000 accepts any command only for the fi rst 5 seconds after
sending the prompt.
*3
*4
DCS
Cmd 1
GC8000
#T
#T
#B or #W
#T
*1
*2
*2
*1: 5 seconds, *2: 8 seconds, *3: 5 seconds or less, *4: 0.04 seconds
● Input command
After successfully processing an input command from DCS, the GC8000 sends
“Answerback (command executed) (#B)” to DCS. After that, the GC8000 accepts up to 6 (7
in total) input commands from DCS.
If it fails to process an input command from DCS, the GC8000 sends “Answerback
(command not executed) (#W)” to DCS. After that, the GC8000 accepts up to 6 (7 in total)
input commands from DCS.
If it receives an invalid input command from DCS, the GC8000 sends “Answerback
(command not executed) (#W)” to DCS. After that, the GC8000 accepts up to 6 (7 in total)
input commands from DCS.
*1
*1
DCS
Cmd 1
Cmd 2
Cmd 3
*2
GC8000
#T
#B or #W
#B or #W
#B or #W
*1: 0.04 seconds, *2: Accepts up to 6 commands including the unexecuted one
● GC8 type
In the GC8-compatible mode, the GC8000 sends “Input command prompt (#T)” once
after sending analysis value, calibration factor, or alarm data. The GC8000 accepts any
command only for the fi rst 5 seconds after sending the prompt.
*1
*1
*2
*3
DCS
#A
#A
GC8000
#E
Data 1
#F
#T
Does not accept any
command after this point
*1: 0.04 seconds, *2: 3 seconds (Does not accept any command) ,*3: 5 seconds
2nd Edition : May 11, 2012-00