Mitsubishi Electric MELSEC iQ-RJ71GF11-T2 - Cyclic Data Holding Time When System Switching Occurs

352
APPX
Appendix 7 Processing Time
Cyclic data holding time when system switching occurs
This section describes cyclic data holding time when system switching occurs.
Redundant master station
The following are the formulas to calculate cyclic data holding time when system switching occurs in the redundant master
station configuration.
*1
*1 The meanings of the variables in the equation are as follows.
*2 For delay time until detection of the system switching cause, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
*3 For availability of GOT, refer to the manual for the GOT used.
*4 Depending on the failure status of the power supply module, the cyclic data holding time (T
H
) is calculated by the following formula.
When Tjo < Msw: 500 + Tsw + Msw + SS
When Tjo > Msw: 500 + Tsw + Tjo + SS
*5 When the redundant function module is removed from the base unit, or depending on the failure status of the base unit, the calculation
formula of the cyclic data holding time (T
H
) may be as follows.
When Tjo < Msw: 2.5 + (2  LS) + Tsw + Msw + SS
When Tjo > Msw: 2.5 + (2  LS) + Tsw + Tjo + SS
Pattern No. System switching cause Condition Cyclic data holding time (T
H
) [ms] Timing chart
1 • Failure of the control system power
supply module
*4
• Power-off of the control system
• Failure of the control system Process
CPU (redundant mode)
• Failure of the control system base unit
*5
• Failure of the control system redundant
function module
*5
Tjo < Msw Delay time until detection of the system
switching cause
*2
+ Tsw + Msw + SS
Page 353 Pattern 1
2 Tjo > Msw Delay time until detection of the system
switching cause
*2
+ Tsw + Tjo + SS
Page 354 Pattern 2
3 • Stop error of the control system Process
CPU (redundant mode)
• Execution of the system switching
instruction
• System switching request from the
engineering tool
• System switching request from another
network module
Tjo < Msw Delay time until detection of the system
switching cause
*2
+ Tsw + Msw + SS
Page 355 Pattern 3
4 Tjo > Msw Delay time until detection of the system
switching cause
*2
+ Tsw + Tjo + SS
Page 356 Pattern 4
5 System switching
request from the
RJ71GF11-T2 (own
station)
Own station data
link error
Tjo < Msw 310 + (2.5  Ns) + Tc + Tsw + Msw + (SS  2) Page 357 Pattern 5
6 Tjo > Msw 310 + (2.5  Ns) + Tc + Tsw + Tjo + (SS  2) Page 358 Pattern 6
7 Communication
error with the
system switching
monitoring target
station
Tjo < Msw 210 + Tc + Tsw + Msw + (SS  2) Page 359 Pattern 7
8 Tjo > Msw 210 + Tc + Tsw + Tjo + (SS  2) Page 360 Pattern 8
Variable Meaning
Tsw Process CPU (redundant mode) system switching time [ms] ( MELSEC iQ-R CPU Module User's Manual (Application))
Tjo Delay time until initial output after system switching [ms] ( MELSEC iQ-R CPU Module User's Manual (Application))
Msw Master station switching time [ms]
• When the slave station is the submaster station, local station, GOT
*3
, or the remote head module configured in a redundant system
Msw = n1 + 340 + Ns  (1.2 + (LS  2)) ? Ns'  (10 + (LS  5)) + (LS  38)
• When the slave station is other than the above
Msw = n1 + 40 + Ns  (1.2 + (LS  2)) + (LS  23)
SS Process CPU (redundant mode) sequence scan time [ms] ( MELSEC iQ-R CPU Module User's Manual (Application))
Tc System switching monitoring time setting value [ms] ( Page 139 Supplementary Cyclic Settings)
Ns The number of slave stations set in "Network Configuration Settings" under "Basic Settings" ( Page 129 Network Configuration Settings)
Ns' The number of the slave stations (only the submaster stations, local stations, GOTs
*3
, or the remote head modules configured in a redundant
system) set in "Network Configuration Settings" under "Basic Settings" ( Page 129 Network Configuration Settings)
LS Link scan time [ms] ( Page 341 Link scan time)
n1 • For 20  LS
n1 = 20
• For 20 < LS
n1 = LS