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9.1 Extension of Scan Time due to Tracking
9
PROCESSING TIME FOR REDUNDANT SYSTEMS
(1) Tracking Data Preparation Time (Tra)
Tracking data preparation time is calculated as shown below.
Z: Number of Program Steps
* 1: X1 to X3 are calculated as follows.
•X1:Processing time according to number of device points for tracking settings
X1=(D1 K1) + (D2 K2) + (D3 K3) + (D4 K4) [ms]
•X2:Processing time according to number of device ranges for tracking settings
X2=(E1 K5) + (E2 K6) + (E3 K7) + (E4 K8) [ms]
•X3:Processing time according to number of tracking blocks for tracking settings
X3=(F1 K9) + (F2 K10) + (F3 K11) [ms]
D1 to D4, E1 to E4, F1 to F3, and K1 to K11 are values used in Table9.3
Tra = 1 + Tra1 + Tra2 + Tra3 + Tra4 (ms)
Tra :Tracking Data Preparation Time
Tra1 to Tra4 :Transfer Data Processing Time Shown in
Ta bl e9 . 2
Table9.2 Processing Times of Tra1 to Tra4
Transfer Data Processing Time (ms)
Tra1 Signal Flow Memory
Time Set Using Redundant
Parameter Tracking
1+0.13x10
-3
Z
Tra2 SFC Information SFC Program Execution Time 1 (Fixed)
Tra3 PID Control Instructions
PIDINIT Instruction Execution
Time
0.5 (Fixed)
S.PIDINIT Instruction
Execution Time
0.5 (Fixed)
Tra4 Device Data –
X1+X2+X3
*1
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