TMC 188/40 Motion Control Module
Appendix B: ASBX/40 Module
Delta Computer Systems, Inc. 360/254-8688
79
PRESSURE LOW
- Range: -32767 to +32767; Default: - 32767
PRESSURE LOW determines the value of PRESSURE ACTUAL at which the TMC 188/40-
TA enters (and exits) pressure mode. Pressure mode is entered when PRESSURE ACTUAL
is greater than or equal to PRESSURE LOW. The TMC 188/40-TA exits pressure mode
when the PRESSURE ACTUAL drops below PRESSURE LOW.
PRESSURE LOW
can be changed at any time without a “P” or “G” command.
PRESSURE COMMAND
- Range: PRESSURE LOW to 32767; Default: 32767
PRESSURE COMMAND is the value the target pressure will ramp to and stay at. It is
specified by the Programmable Controller. The TMC 188/40-TA attempts to make the
PRESSURE ACTUAL match the target pressure whenever it is in pressure mode.
PRESSURE COMMAND
can be changed at any time without a “P” or “G” command.
MODE and STATUS WORD Changes
MODE Word Bit 10
Bit 10 of the MODE Word is used to select pressure mode. When bit 10 is true, the pressure
mode is turned on. When bit 10 is false, the TMC 188/40-TA is in magnetostrictive
transducer mode. A new command must be issued to the TMC 188/40-TA for a change in bit
10 to be detected.
If analog position mode jumpers P4 1 through 4 are present, they override bit 10 for any axis
they are installed on. Installing a jumper places the axis in analog position mode regardless
of the state of bit 10.
STATUS Word Bits 10 through 13
Bit 10 (Stopped bit) indicates both when the axis is stopped and when it is in pressure mode.
Bit 11 (Decelerating bit) indicates the PRESSURE TARGET is ramping down when in
pressure mode.
Bit 12 (At Speed bit) indicates the PRESSURE TARGET is the same as PRESSURE
COMMAND.
Bit 13 (Accelerating bit) indicates the PRESSURE TARGET is ramping up when in pressure
mode.
Pressure-Specific Commands
The TMC 188/40-TA accepts the following pressure-specific commands:
‘\’ - Set Pressure Ramp
(5CH, 92D)
This command sets the rate at which the pressure target ramps to a new command pressure.
The units are 0.01 pressure units per 2 milliseconds. A value of 200 will ramp the pressure
target by 1,000 pressure units in 1 second.
