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6.12 Absolute Encoders
6.12.4 Reading the Position Data from the Absolute Encoder
6-75
6
Application Function
s
*1.
When you turn OFF the control power supply, turn OFF the SEN signal.
*2.
The pulse output time T for the position of the absolute encoder within one rotation depends on the setting of Pn212
(Number of Encoder Output Pulses). Refer to the following table.
Sequence for Reading the Position Data from the Absolute
Encoder without Using the SEN (Absolute Data Request) Signal
The sequence for reading the position data from the absolute encoder of a Rotary Servomotor without
using the SEN signal is given below.
Setting of Pn212
Calculation of the Pulse Output Speed
for the Position of the Absolute
Encoder within One Rotation
Calculation of the Pulse Output Time T
for the Position of the Absolute
Encoder within One Rotation
16 to 16,384
680
×
Pn212/16,384 [kpps]
25 ms max.
16,386 to 32,768
680
×
Pn212/32,768 [kpps]
50 ms max.
32,722 to 65,536
680
×
Pn212/65,536 [kpps]
100 ms max.
65,544 to 131,072
680
×
Pn212/131,072 [kpps]
200 ms max.
131,088 to 262,144
680
×
Pn212/262,144 [kpps]
400 ms max.
262,176 to 524,288
680
×
Pn212/524,288 [kpps]
800 ms max.
524,352 to 1,048,576
680
×
Pn212/1,048,576 [kpps]
1,600 ms max.
1,048,704 to 2,097,152
680
×
Pn212/2,097,152 [kpps]
3,200 ms max.
2,097,408 to 4,194,304
680
×
Pn212/4,194,304 [kpps]
6,400 ms max.
•
Maintain the SEN signal at the high level for at least 1.3 seconds when you turn it OFF before you
turn it ON again, as shown in the following figure.
•
The SEN signal is not acknowledged while the servo is ON.
Power
s
upplied.
Main circuit
power
s
upply
Control power
s
upply
*1
/
S
-RDY
s
ignal
ALM
s
ignal
/
S
-ON
s
ignal
S
EN
s
ignal
*1
PAO
s
ignal
PBO
s
ignal
P
S
O
s
ignal
Motor power
s
tatu
s
Multiturn data
Incremental pul
s
e
s
Incremental pul
s
e
s
ON
OFF
OFF
ON
No alarm
ON
OFF
ON
OFF
Power not
s
upplied.
ON
OFF
Undefined.
Undefined.
Undefined.
5
s
max.
50 m
s
Approx. 15 m
s
1 m
s
to
3
m
s
T
*2
90 m
s
typ.
Po
s
ition within one rotation
(incremental pul
s
e
s
)
Po
s
ition within one rotation
(incremental pul
s
e
s
)
Multiturn data + po
s
ition
within one rotation
S_Analog
Important
OFF
ON (high level)
1.
3
s
min.
OFF
ON
15 m
s
min.
S
EN
s
ignal