Mitsubishi Electric R60AD8-G - Page 287

10 FUNCTIONS
10.8 SIL2 A/D Conversion Function
285
10
Operation
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.
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.
R60AD8-G
(Main)
R60AD8-G
(Sub)
9990
10010
10010
9990
(1)
(1)
(2)
(3)
(2)
(4)
10000
(5)
(5)
SIL2 Process CPU
Digital operation
value B
Digital operation
value B
Digital operation
value A
Digital operation
value A
SIL2 diagnostic
FB library
Safety device