Delta RMC101 User Manual

Page 549

Analog 6.1

Transducer Interface Modules

6-5

• Differential Force Control

This mode uses both channels in the pair and an analog drive output. The input channels are
connected to pressure transducers, the drive output is connected to the force-controlling valve or
motor, and they work together to hold a force or ramp the force in closed-loop control.
The first channel’s input will be converted to a force using the Scale A and Offset A parameters,
and will be displayed in the Actual Force A field. The second channel in the pair (channel 1 or 3
depending on the pair) will be converted to a force using Scale B and Offset B, and will be
displayed in the Actual Force B field. Then, Force B will be subtracted from Force A to give the
Actual Force, which is used for differential force control.

• Auxiliary Differential Force

This mode uses both channels in the pair. This mode acts the same as Differential Force Control
mode—described above—except that there is no drive output, so instead another axis’ drive
output must be used. The most common reason for doing so is to have a system with a position-
to-force transition. In this case, a position control axis is assigned to the auxiliary differential force
channel. The position transducer is connected to the position control axis’ input, the pressure
transducers are connected to the differential force channels, and each of the position and force
inputs use the drive output when it is in control.

• Auxiliary Analog

This mode uses a single analog channel. This mode is no longer supported.

• Auxiliary Differential Analog

This mode uses both channels in the pair. This mode is no longer supported.

Note:

At no time will the RMC100 allow more than eight axes. Any extra axes will be ignored.

For example, suppose a system has one 2-axis MDT card and two 4-channel analog cards. If all
eight channels are configured as single-ended analog axes, then this would total ten axes, which
is not allowed. Therefore, the last two channels on the last analog card will not be usable.

Select the Analog Transducer Type
Use bits 12-15 of the Configuration word to select one of the following input ranges as described
in that parameter’s topic:

• Voltage: 0 to 10V

• Voltage: -10V to +10V

• Voltage: 0 to 5V

• Voltage: -5V to +5V

• Current: 4 to 20mA

See the COUNTS topic for detailed information on the maximum and minimum limits of the
various analog input ranges.