Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 67)

5-10
<5. Actions of External Input and Output Signals >
IM 11B03A03-01E 3rd Edition : Aug. 23. 2006-00
I/O instruction format and communication control procedure for handshaking
C
R
L
F
# E
C
R
L
F
# F
C
R
L
F
# T
C
R
L
F
# B
# # W
C
R
L
F
# W
C
R
L
F
# A
C
R
L
F
# R
I/O instruction format Communication control procedure
E: Data receiving
request
F: Data transmission
completion
T: Input command
prompt
B: Answerback
(command executed)
W: Answerback
(command not
executed)
If the command is
in an incorrect
format, answerback
is in the format
shown at right.)
A: Data transmission
request
R: Data
retransmission
request
A A A
E F Data 1 Data n
Supervisory computer
GCCU
Output upon analysis completion or occurrence of an error alarm
(after transmission completion if the component concentration value or
calibration factor is being transmitted)
● Normal communication
A R R
E Data 1 Data 1 Data 1
Supervisory computer
GCCU
● Retransmission
Note: If retransmission is requested, data can be transmitted any number of times. If the
total communication time exceeds one analysis cycle, the data is changed into
new data. (The limiter should be considered for the supervisory computer side.)
T B or W B or W
Command
1
5 seconds
Command
2 Supervisory computer
GCCU
● Input command
Note: If the sequence has stopped, input commands can be received
continuously until the start signal is received.
5 seconds
Up to 6 commands including those
not executed
Output after
completion of
data transmission
or every 8 to 10
sec periodically
Re-prompted if there is no
command. If there is no command
upon re-prompting, it is assumed
that there is no command. If there is no
command during
this period, it is
assumed that
there is no
command.
E E
E E
E
Supervisory computer
GCCU
● Error handling
3
seconds
3
seconds
E
3.2 seconds
(for reference)
(No response from the computer)
The same
command is
repeated.
(No response from GCCU)
Output instruction
Input instruction
F0510.EPS