Analog Fundamentals

"Analog" in the RMC refers to analog voltage or current.

Analog Inputs

Analog voltage or current feedback coming to the RMC is sampled multiple times per loop time. At each sampling, the voltage or current is converted to a number by an ADC (Analog to Digital Converter). The samples are then averaged to produce one number per loop time. See the data sheets of each analog feedback module for details on the resolution of the analog-to-digital conversion.

The following modules support analog feedback from a transducer or potentiometer:

Module	±10 V	±5 V	4-20 mA	±20 mA
RMC75
AA1
AA2
A2
AP2
RMC150
Analog (H)
Analog (G)
Analog Inputs (A)
Universal I/O
RMC200
A8
U14

Broken Wire Detection

The RMC analog inputs incorporate internal biasing so that when an input is not connected, the input voltage will be pulled down to its full negative value.

On the RMC75 and RMC150, a broken wire will cause the Transducer Overflow error bit for the associated axis to turn on.

On the RMC200, a broken wire will cause the No Transducer error bit for the associated axis to turn on.

Analog Outputs

The following modules have analog outputs, normally intended for use as a Control Output:

Module	±10 V	4-20 mA	±20 mA
RMC75
AA1, AA2
MA1, MA2
QA1, QA2
RMC150
Analog (H)
Analog (G)
MDT (M)
Quad (Q)
Resolver (R)
SSI (S)
RMC200
CA4
CV8
U14