Cyclic Data Holding Time When System Switching Occurs - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

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.
Pattern No. System switching cause
1 • Failure of the control system power
supply module
• Power-off of the control system
2
• Failure of the control system Process
CPU (redundant mode)
• Failure of the control system base unit
• Failure of the control system redundant
function module
3 • Stop error of the control system Process
CPU (redundant mode)
• Execution of the system switching
4
instruction
• System switching request from the
engineering tool
• System switching request from another
network module
5 System switching
request from the
6
RJ71GF11-T2 (own
7
station)
8
*1 The meanings of the variables in the equation are as follows.
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
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
system) set in "Network Configuration Settings" under "Basic Settings" ( Page 129 Network Configuration Settings)
LS Link scan time [ms] ( Page 341 Link scan time)
• For 20  LS
n1
n1 = 20
• For 20 < LS
n1 = LS
*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
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
When Tjo < Msw: 2.5 + (2  LS) + Tsw + Msw + SS
When Tjo > Msw: 2.5 + (2  LS) + Tsw + Tjo + SS
APPX
352
Appendix 7 Processing Time
*1
*4
*5
Own station data
link error
Communication
error with the
system switching
monitoring target
station
) may be as follows.
H
Condition Cyclic data holding time (T
Tjo < Msw Delay time until detection of the system
switching cause
Tjo > Msw Delay time until detection of the system
switching cause
*5
Tjo < Msw Delay time until detection of the system
switching cause
Tjo > Msw Delay time until detection of the system
switching cause
310 + (2.5  Ns) + Tc + Tsw + Msw + (SS  2)
Tjo < Msw
310 + (2.5  Ns) + Tc + Tsw + Tjo + (SS  2)
Tjo > Msw
210 + Tc + Tsw + Msw + (SS  2)
Tjo < Msw
210 + Tc + Tsw + Tjo + (SS  2)
Tjo > Msw
*3
, or the remote head module configured in a redundant system
) [ms] Timing chart
H
Page 353 Pattern 1
*2
+ Tsw + Msw + SS
Page 354 Pattern 2
*2
+ Tsw + Tjo + SS
Page 355 Pattern 3
*2
+ Tsw + Msw + SS
Page 356 Pattern 4
*2
+ Tsw + Tjo + SS
Page 357 Pattern 5
Page 358 Pattern 6
Page 359 Pattern 7
Page 360 Pattern 8
*3
, or the remote head modules configured in a redundant
) is calculated by the following formula.
H