FB#.RES

Description

FB#.RES reports the actual encoder resolution of the feedback device. The drive calculates its value based on the encoder characteristics. It is provided in encoder counts/rev for rotary encoders and encoder counts/mm for linear encoders.

For digital-only feedbacks like incremental and HiperfaceDSL, the resolution will either be what the encoder indicates it supports or the resolution configured in the drive with FB#.ENCLINES or FB#.LINEPITCH. For feedbacks with an analog component (i.e. Sin/Cos, resolver, EnDat, etc.) the resolution will be the analog resolution including the drive’s 24-bit A/D conversion to indicate the higher resolution available.

FB#.RES is not the number of counts per revolution or pole pair for the position reported by FB#.P. FB#.PRES shows the resolution of FB#.P.

Examples

  • Sin/Cos rotary configured with 1024 lines/rev in FB#.ENCLINES:

    FB#.RES equals 1024 Periods over Rev multiplied by 2 to the 24th power Counts over Period is equal to 17,179,869,184 End Cnts per Rev

  • HiperfaceDSL rotary with 18 bits single turn + 12 bits multiturn:

    FB#.RES equals 2 to the 18th power which equals 262, 144 Enc Cnts per Rev

  • EnDat Analog linear with 20,000 nm/line

    2 squared 24 counts divided by period divided by 20 comma 000 nm divided by period times 1 million nm divided by 1 mm equals 838 comma 860 comma 800 Enc Cnts divided by mm

Versions

Action Version Notes
Implemented 02-00-00-000

General Information

Type

Read Only

Units

Rotary: Enc Cnts/revolution

Linear: Enc Cnts/mm

Range

N/A

Default Value

N/A

Data Type

Integer

Stored in Non-Volatile Memory

No

Variants Supported

All variants are supported.