Mitsubishi Electric R60AD8-G User Manual page 287

Operation
SIL2 diagnostic
Safety device
FB library
(5)
10000
SIL2 Process CPU
No. Description
(1) The R60AD8-G (Main) and R60AD8-G (Sub) mutually exchange digital operation values obtained from each module.
(2) Whether the digital operation values are within the allowable error range set in "Duplex input error range setting" is verified, and the mean
value of the digital operation values A and B is calculated. If the verification result is double input discrepancy, the mean value of the digital
operation values A and B becomes the OFF value (equivalent to 0V/0mA).
(3) The verification results of (2) in R60AD8-G (Main) and R60AD8-G (Sub) are mutually verified. If an error is detected by mutual verification, a
hardware failure (error code: 3001H) occurs. Also, a safety communication timeout (error code: 1A63H) occurs in the SIL2 Process CPU.
(4) The R60AD8-G (Main) sends the verification result and the mean value of the digital operation values A and B to the SIL2 diagnostic FB
library.
(5) The SIL2 diagnostic FB library stores the mean value of the digital operation values A and B to the safety device specified by the SIL2
diagnostic FB library. For channels where a discrepancy (allowable error range exceeded) was detected the specified times or more (the
times set in "Duplicated input mismatch detection count" or more), a double input discrepancy detection error (error code: 1EDH) occurs.
If disconnection occurs in wiring of the R60AD8-G (Main) or R60AD8-G (Sub), a double input discrepancy
detection error (error code: 1EDH) occurs.
Digital operation
value A
(1)
9990
Digital operation
value B
(1)
10010
(2)
(2)
(3)
(5)
(4)
R60AD8-G R60AD8-G
(Sub)
(Main)
Digital operation
value A
10010
Digital operation
value B
9990
10 FUNCTIONS
10.8 SIL2 A/D Conversion Function
10
285