5
5.5 Tracking Function
5.5.7 Tracking Mode
5
- 92
1
OV
ER
VIE
W
2
SYS
TEM
CONFIGURA
TI
ON
3
TR
AC
KI
N
G
C
ABL
E
4
P
R
OCE
DURE
FO
R
S
TAR
TING
UP
A
RE
DUN
DAN
T
S
Y
S
T
E
M
5
RE
DUNDA
NT S
Y
S
T
E
M
FUNCTIONS
6
RE
DUN
DAN
T
S
Y
S
T
E
M
NE
TW
O
R
K
S
7
PR
OG
R
A
MM
IN
G
CA
UTIO
N
S
8
TR
O
U
BLE
S
HOOTING
(b) Program Priority Mode
In program priority mode, the control system CPU module executes the scan
execution type program as soon as tracking starts.
If tracking time is longer than program execution time, the next tracking cannot
start until the current tracking is completed.
In this mode, the scan time can be made shorter than in synchronized tracking
mode.
However, if system switching occurs, the new control system CPU starts operation
based on the tracking data of up to 2 scans before.
Diagram 5.53 Tracking Operation Timing When Program Execution Time Tracking Processing Time
Diagram 5.54 Tracking Operation Timing When Program Execution Time Tracking Processing Time
0
1) tracking when program run time tracking time
Control system
CPU module
END
Run
program 1)
END
0
Run
program 2)
END
0
0
Run
program 3)
Scan time
Prepare Tracking
data 1)
Prepare Tracking
data 2)
Prepare Tracking
data 3)
Tracking
processing 1)
Adjust Tracking
data 1)
Tracking
processing 2)
Adjust Tracking
data 2)
Tracking
processing 3)
Device data for new control system CPU module
Run program
Non - executed
END
Error occurrence
Incomplete
Send
Receive
Send
Receive
Send
Receive
New Standby system
CPU module
Standby system
CPU module
New Control system
CPU module
2) Tracking when program run time tracking time
Control system
CPU module
END
0
END
Run
program
2)
Run
program 1)
Waiting 1)
Scan time
Prepare Tracking
data 1)
Adjust Tracking
data 1)
0
END
Run
program
3)
Waiting 2)
Prepare Tracking
data 2)
Adjust Tracking
data 2)
0
Prepare Tracking
data 3)
Tracking
processing 1)
Tracking
processing 2)
Receive
Send
Send
Receive
Standby system
CPU module
