Appendix 11 Calculation Method Of Safety Response Time (Maximum Value) - Mitsubishi Electric MELSEC iQ-RX40NC6B Application User's Manual

Appendix 11
The safety response time is the maximum time taken from when the safety input of the RX40NC6B (intelligent device station
(safety station)) turns off until the safety output of the RY40PT5B (intelligent device station (safety station)) turns off (the time
including an error detection).
This maximum time is calculated by the following formula.
Intelligent device station (safety station) on the input side  Master station (safety station)  Intelligent device station (safety
station) on the output side
(SCmst  3) + (S2cycin  2 + S2cycout  2.5) + (RMin + RMout) + SRin + SRout + (nin  2) + (nout  2)
Symbol
SCmst
S2cycin
S2cycout
RMin
RMout
SRin
SRout
nin
nout
a
b
c
d
TMmstin
TMmstout
TMrmtin
TMrmtout
*1 For Safety cycle time, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
*2 For details, refer to the following.
Page 126 Performance Specifications
*3 For details, refer to the following.
 MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
*4 A sample calculation of b and d:
When Transmission interval monitoring time is 24ms and Safety cycle time is 10ms, the result is 20; the smallest multiple of 10 which is
greater than the value of 12 (obtained from 24  2).
*5 For Safety I/O HOLD time, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
APPX
216

Appendix 11 Calculation Method of Safety Response Time (Maximum Value)

Calculation Method of Safety Response
Time (Maximum Value)
Description
Safety cycle time of the master station (safety station)
Control cycle time of the input side (RX40NC6B (Main))
Control cycle time of the output side (RY40PT5B (Main))
Safety refresh monitoring time of the input side connection of the master station (safety station)
*5
HOLD time
Safety refresh monitoring time of the output side connection of the master station (safety station) + Safety I/O
*5
HOLD time
Safety input response time for SIL2 mode
Safety output response time for SIL2 mode
RMin - (TMmstin  2) - TMrmtin + c
RMout - TMmstout - (TMrmtout  2) + a
TMmstout - b (This value is valid only when a station set to Active is the RJ71GF11-T2. Otherwise plug 0.)
A smallest multiple of Safety cycle time value which is greater than the calculation result of TMmstout divided by 2.
TMrmtin - d (This value is valid only when a station set to Passive is the RJ71GF11-T2, or when a station set to
Passive is the RJ72GF15-T2 that is connected with the RX40NC6B and RY40PT5B. Otherwise plug 0.)
A smallest multiple of Safety cycle time value (Control cycle time of the RX40NC6B (Main)) which is greater than
the calculation result of TMrmtin divided by 2.
Transmission interval monitoring time of the input side connection of the master station (safety station)
Transmission interval monitoring time of the output side connection of the master station (safety station)
Transmission interval monitoring time of the input side (RX40NC6B (Main))
Transmission interval monitoring time of the output side (RY40PT5B (Main))
*1
*2
*2
*2
*2
*4
*3
+ Safety I/O