Allen-Bradley Rockwell Automation 842E-MIP Series, User Manual

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Rockwell Automation Publication 842E-UM001B-EN-P—April 2015
Chapter 3 EtherNet/IP overview
Other Ratios Tested
Features:
Numerator Denominator
Measuring
Range (CMR)
Bi-Directional
Rollover Test
Pass/Fail
One Rev
Distance Check
Test
One Rev Distance
Accuracy (counts) NOTES
2 2 4096 Pass Pass
2 4 4096 Pass Pass
I.Position traverses 2 cyles / turn of the encoder
with an unwind at 4096
2 8 4096 Pass Pass
I.Position traverses 4 cycles / turn of the encoder
with an unwind at 4096
2 32 4096 Pass Pass
I.Position traverses 16 cycles / turn of the encoder
with an unwind at 4096
16 32 4096 Pass Pass
I.Position traverses 2 cyles / turn of the encoder
with an unwind at 4096
16 32 131072 Pass Pass
I.Position traverses 2 cyles / turn of the encoder
with an unwind at 131072
16 32 131073 Pass Pass
I.Position doesn’t update and remains at zero.
The is expected behavior as the CMR limit is
131072 based on the following formula
CMR = (CNR_N / CNR_D) * CPR where CPR =
262,144
8 32 65536 Pass Pass
I.Position traverses 4 cyles / turn of the encoder
with an unwind at 65536
8 32 65537 Pass Pass
I.Position doesn’t update and remains at zero.
The is expected behavior as the CMR limit is
65536 based on the following formula
CMR = (CNR_N / CNR_D) * CPR where CPR =
262,144
Attribute 14 (e hex) Scaling Function Control (SFC)
Attribute 125 (7d hex) Endless Shaft Functionality (ESF)
Attribute 126 (7e hex Nominator (CNR_N)
Attribute 127 (7f hex)– Divisor (CNR_D)
Attribute 17 (11 hex) Total Measuring Range (CMR)
Making online scaling changes, through the modules profile, is
not allowed unless the encoder device is inhibited. Executing
online changes will display an error message “Failed to modify
properties. Failed to send configuration data to the module.”
Consequently changes will be ignored. Online changes should
be noted as “not allowed” in our documentation.
IMPORTANT