Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 70)

<5. Actions of External Input and Output Signals >
5-13
IM 11B03A03-01E 3rd Edition : Aug. 23. 2006-00
Non-protocol output signal transmission timing
● Send Data (SD)
● Request to Send (RS)
● Terminal Equipment Ready (ER)
Analysis data
AUTO mode analysis
completion point
+9V (RS232C)
Calibration factor
During AUTO mode calibration
+9V (RS232C)
Error alarm
When an alarm occurs (after transmission
completion if the component concentration
value or calibration factor is being transmitted)
+9V (RS232C)
(Always ON)
Processor power ON
+9V (RS232C)
(Transmission completion)
(Transmission completion)
F0516.EPS
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
t (0.4 to 0.5 second)
t
t
t t
t t
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
F0517.EPS
Note: If #ACRLF or #RCRLF is not received in 20 seconds or more after the data has been sent, the transmission of the
analysis data of that cycle will be aborted.