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(c)
1-phase 1-input counter (K8 to K11)
Hardware UP/DOWN (K8, K9)
Phase A
OFF
ON
Phase B
OFF
UP
Current
value
(d)
1-phase 2-input counter (K6, K7)
ON
Phase
OFF
A input
ON
Phase
B input
OFF
1 2 3 3 3 2 1 0
(e)
2-phase counter (K0 to K5)
1 edge-count-counter (K0, K1)
Phase A
+1
Phase B
Phase B inputOFF
→ON while phase
A input ON Count
up by 1.
4 edge-count counter (K4, K5)
UP COUNT :
Phase A input
Phase B input
ON
UP/DOWN is
determined by
input phase A
(ON/OFF).
DOWN
Phase A input -1 at
OFF→ON.
Phase B input+1 at
OFF→ON.
+1
Phase B input ON
→OFF while phase
A input ON Count
down by 1.
+1
+1 +1
+1
Software UP/DOWN (K10, K11)
BFM #1
K0
ON
Phase B
OFF
Current
value
If both phase A and phase B inputs are received
simultaneously, the counter value dose not
change.
2 edge-count counter (K2, K3)
Phase A
+1
-1
Phase B
Phase B input OFF
→ ON while phase
A input ON Count
up by 1.
DOWN COUNT :
Phase A input
-1
Phase B input
K1
UP/DOWN is de-
termined by the
contents of BFM
#1, (K0/K1).
UP
DOWN
+1
-1
Phase B input ON
→OFF while phase
A input ON Count
down by 1.
-1
-1
-1
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