10 FUNCTIONS
10.8 SIL2 A/D Conversion Function
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10
Timing chart of the SIL2 A/D conversion function
The function behavior differs between the normal state and when the A/D conversion circuit diagnostic function is executed.
■Normal state
Odd number channel double input discrepancy detection and even number channel double input discrepancy detection are
repeated alternately for each SIL2 A/D conversion cycle.
■When the A/D conversion circuit diagnostic function is executed
When the A/D conversion circuit diagnostic function is executed, the double input discrepancy detection function and A/D
conversion circuit diagnostic function are repeated alternately for each A/D conversion circuit diagnostic cycle. (The double
input discrepancy detection function is not executed for start-up A/D conversion circuit diagnostics.)
A/D conversion circuit diagnostics consists of two patterns of digital values for diagnostics, and up to six retries are attempted
for each pattern. Each digital value for diagnostics consists of four cycles.
Therefore, the A/D conversion circuit diagnostic function will be executed for 8 (minimum) to 56 (maximum) cycles.
The following figure shows the entire timing chart of the A/D conversion circuit diagnostics.
The following figure shows the timing chart of one digital value for diagnostics.
1st cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
2nd cycle 3rd cycle 4th cycle
Double input
discrepancy
detection
(odd CH) (1)
Double input
discrepancy
detection
(even CH) (2)
Value of (1)
Value of (2) Value of (4) Value of (6)
Value of (3) Value of (5) Value of (7)
Double input
discrepancy
detection
(odd CH) (3)
Double input
discrepancy
detection
(even CH) (4)
Double input
discrepancy
detection
(odd CH) (5)
Double input
discrepancy
detection
(even CH) (6)
Double input
discrepancy
detection
(odd CH) (7)
Double input
discrepancy
detection
(even CH) (8)
Digital operation
value for odd channel
Digital operation
value for even channel
Digital value for diagnostics (pattern 1) Digital value for diagnostics (pattern 2)
Retries of 6 times at maximum Retries of 6 times at maximum
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 1), 1st time
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 1), 2nd time
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 1), 7th time
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 2), 1st time
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 2), 2nd time
A/D conversion circuit
diagnostics: Digital
value for diagnostics
(pattern 2), 7th time
1st cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
SIL2 A/D conversion
cycle
2nd cycle
One digital value for diagnostics
3rd cycle 4th cycle
Double input
discrepancy
detection
(odd CH) (1)
A/D conversion
circuit diagnostics
(odd CH of the
R60AD8-G (Main))
Value of (1)
Value of (2)
Value of (3)
Value of (4)
Double input
discrepancy
detection
(even CH) (2)
A/D conversion
circuit diagnostics
(even CH of the
R60AD8-G (Main))
Double input
discrepancy
detection
(odd CH) (3)
A/D conversion
circuit diagnostics
(odd CH of the
R60AD8-G (Sub))
Double input
discrepancy
detection
(even CH) (4)
A/D conversion
circuit diagnostics
(even CH of the
R60AD8-G (Sub))
Digital operation
value for odd channel
Digital operation
value for even channel
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