Mitsubishi Electric MELSECQ Series User Manual page 62

5
FUNCTIONS
5
- 6
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(a) When using within the specified range
1) Normally the following range is applied.
" Ring counter lower limit
value
( Un\G0 and 1
a) General operation
Present counter value
Subtraction
Figure 5.3 Ring counter operation image 1
b) Setting method
• Set the ring counter upper limit value (Un\G2 and 3), ring counter lower
limit value (Un\G0 and 1) and preset value setting (Un\G4 and 5) as
shown below, and then turn ON the preset command (Y02).
• After the preset value setting (Un\G4 and 5) became effective, turn OFF
the preset command (Y02) and turn ON the count enable command (Y04).
"
Ring counter lower limit
value
( Un\G0 and 1
c) Count operation
• Addition count
When the present value A
and 201
ring counter lower limit value
present value A
• Subtraction count
Even if the present value A
and 201
counter lower limit value
subtraction pulse, "Ring counter upper limit value (Un\G2 and 3) -1" is
stored in the present value A
and 201
In both cases of addition and subtraction counts, the ring counter upper limit value
(
Un\G2 and 3) is not stored in the present value A
(
B Un\G200 and 201
However, the operation is the same as for the case of counting from the ring
counter lower limit value (Un\G0 and 1) if the addition/subtraction count is
performed when the count enable command (Y04) status changes from OFF to
ON or the preset command (Y02) is executed while "Present value A (Un\G10 and
11)/present value B (Un\G200 and 201)
and 3) is satisfied.
5.2 Selecting Counter Format
5.2.2 Selecting the ring counter
search engine
Present value A/
present value B
) ( Un\G10 and 11
( Un\G200 and 201
0
Addition
Preset value setting
) ( Un\G4 and 5
( Un\G10 and 11
)
reaches the ring counter upper limit value
(
Un\G0 and 1
( )
Un\G10 and 11 /present value B
(
Un\G10 and 11
)
reaches the ring counter lower limit value
(
Un\G0 and 1
(
Un\G10 and 11
)
.
)
.
Ring counter upper limit
value
)/ ( Un\G2 and 3
)
+2147483647
Ring counter upper limit value (Un\G2 and 3)
Ring counter lower limit value (Un\G0 and 1)
-2147483648
Ring counter upper limit
value
) ( Un\G2 and 3
) /present value B (
(
Un\G2 and 3
)
is automatically stored in the
(
Un\G200 and 201
)
/present value B
(
Un\G0 and 1
)
is held as it is. And by the next
)
/present value B
( )
Un\G10 and 11 /present value
Ring counter upper limit value (Un\G2
"
)
"
)
Un\G200
)
, the
).
(
Un\G200
)
, the ring
(
Un\G200