Delta AS Series Programming Manual page 768

Action
Mode
6. CurCnt: The current counter value of the appointed module channel.
7. ST: Single-Turn data of an absolute type SSI encoder. If the counter mode is in absolute position, the value of ST is
an offset value. For the Ring counter, the value of ST is an original SSI figure. For an incremental encoder, the value
of ST is 0.
8. MT: Multi-turn data of an absolute type SSI encoder. If the counter mode is in absolute position, the value of MT is an
offset value. For the Ring counter, the value of MT is an original SSI figure. For an incremental encoder, the value of
MT is 0.
9. AStat: Status data of an absolute type SSI encoder. For an incremental encoder, the value of AStat is 0.
10. RefCnt: Refreshing counter of an absolute type SSI encoder, within a maximum range of 16-bit. When one SSI data
is captured, add one to the value of RefCnt. Once an overflow occurs, the refreshing counter starts counting from 0.
For an incremental encoder, the value of RefCnt is 0.
11. Dir: Counting direction, when the value is ON, it goes in the positive direction; when the value is OFF, it goes in the
negative direction.
12. CntStat: Counting status
Bit number Status
15 ~ 11 Reserved
SSI absolute
positon
10
encoder
experiencing
zero crossing
SSI
9 communication
check
SSI parity
8
check
SSI data
exceeding the
7
set acceptable
range
6 Reserved
Function
3.
4.
Description
Reserved
In HWCONFIG you can set the option to detect or not to detect
if the absolute position crossing zero point. (default: detection
disabled)
If the counter mode is in Absolute Position and you have set the
0: normal offset, the detection starts after the value is offset.
1: abnormal If the counter type is Ring Counter, the offset value will be reset
to zero. The detection starts at the initial position of the SSI.
Cause of the error: zero crossing
Ways to clear the error: use the DHCCNT instruction to
reset/preset or execute RESET by the Z phase.
Cause of the error: abnormal communication for 5 times in a row
0: normal
Ways to clear the error: the communication comes back to
1: abnormal
normal
0: normal Cause of the error: parity check failed
1: abnormal Ways to clear the error: the next parity check pass
Cause of the error: SSI data exceeding the set acceptable range
0: normal
Ways to clear the error: when the SSI data stops exceeding the
1: abnormal
set acceptable range
Reserved
Cha p ter 6 App l ied Ins truc tio ns
Description
first value to be compared in the table, the comparison stops.
If this happens, you can use the Update flag (ON) from the
DHCCMPT instruction to perform comparison again.
Clear the flags of Match1 and Match2 from DHCCMPT
instruction.
Clear the assigned Y output points (ONOFF) from
DHCCMP and DHCCMPT instructions.
Remarks
6_
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