7 Product-specific CAN objects XN300 slice modules
7.25 XN-322-1CNT-8DIO
332
Gateway XN-312-GW-CAN
06/16 MN050003-EN www.eaton.eu
7.25.3 Encoder Idle Time (Object 0x30F1)
Object 0x30F1 contains the number of pulses triggered by the internal time
reference (IdleClock) since the last encoder count value increment (rising
edge on signal A). This register makes it possible to measure frequencies
and speed.
An internal register will be internally incremented at the idle clock time inter-
val defined in object 9x40F3 and copied to the encoder idle time register with
every rising edge on the counter input (A) (X1 encoding), after which it will be
reset.
This means that the content of the encoder idle time register provides a mea-
surement of the time interval between two count pulses.
The counting direction will be determined using the second channel of coun-
ter input (B), with the sign (MSB) being interpreted as the direction of rota-
tion.
This measurement will yield the "pulses per second" frequency as per the for-
mula below:
f
IPS
: "Pulses per second" frequency
f
CLK
: Frequency Clock
If the speed increases, the value in the encoder idle time register will
decrease, i.e., the time measured will be shorter. If the speed decreases, a
larger number of pulses will be added, so that the time measured will be lon-
ger. If the register's content reaches its maximum value, it must be assumed
that the motor has stopped or that there is an open wire. The comparison
between the content of the internal count register and the specified maxi-
mum value in the maximum idle time register will cause the incrementing
operation to be stopped, the counter value to be copied to the encoder idle
time register, and the counting operation to then be restarted. The direction
of rotation will then be indicated as being positive.
Feature
Description / Value
EDS
Name
IdleTime
[MxSubExt30F1]
ParameterName=IdleTime
ObjectType=0x7
DataType=0x0004
AccessType=ro
PDOMapping=1
Count=1
Description
Encoder Idle Time
Object Code
VAR
Mapping
PDO
Manual
Data type
INTEGER32
Sub index
01 … FE
hex
Access
ro
f
IPS
=
f
CLK
(Encoder Idle Time * Idle Clock Pre-Scaler
Содержание XN-312-GW-CAN
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