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Spec Tech Industrial Electric
Chapter 1: Introduction & Overview
The Series 1746R PLC Resolver Interface Module is a resolver based unit that incorporates
Allen-Bradley SLC 500 I/O interface technology, and is completely compatible with the A-B
Series 1746R I/O chassis. The unit monitors machine/process position and delivers absolute
position data with up to 12 bit
(4096 count) resolution per turn to the SLC 500 processor.
The Series 1746R PLC Resolver Interface Module is available in two versions:
1746R-1 is for single axis applications and uses a single turn resolver. Standard "Turns
Counting" software allows a single turn resolver to be used in multi-turn applications.
1746R-2 is for dual axis applications and can use two, single turn resolvers to monitor
each axis independently, or is field configurable for use with a single, multi-turn dual
resolver to monitor a single axis for absolute positioning over multiple revolutions.
The 1746R PLC Resolver Interface Module will read in the "raw position" from 1 or 2 resolvers,
convert it to a scaled position and transmit that data to the A-B SLC 500 processor I/O image
table.
The software allows field programming of Motion Detection of a RPM value which sets a bit in the I/O
image table.
The software also will monitor two auxiliary inputs, that can be field configured to operate in one of two
ways:
Reset-to-Preset. This feature allows you to continuously synchronize position data to
the leading edge of the product or to automatically compensate for process drift.
Brake monitoring in metal stamping applications. In this configuration, automatic
calculation of stop time and stop angle is transferred to the I/O image table. In addition,
two programmable time limits are available to monitor maximum stop values: the first as
a potential maintenance warning, and the second as an error if the press exceeds the
programmed maximum acceptable stop time. These status bits are set at the time the
limits are exceeded, not after the press stops.
NOTE: A brake fail feature is also in the Brake Monitor configuration. A status bit in the image table
will be set if the resolver moves by more than +/- 20 degrees (out of 360 degrees) after a
stop has been determined.
System parameters are programmed through the I/O image table. These parameters include the
position scaling data, the motion detect RPM, brake monitor data and reset-to-preset data.
System data is read from the I/O Image table. This data includes the scaled position and RPM of each
resolver, the state of the inputs and error flags in the system.
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Spec Tech Industrial Electric
www.spectechind.com
Installation & Programming Manual
www.spectechind.com
888-773-2832
Chapter 1: Introduction & Overview
888-773-2832
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