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DMC-3425 Contents• v
Displaying Variables and Arrays.............................................................................137
Interrogation Commands.........................................................................................137
Formatting Variables and Array Elements ..............................................................139
Converting to User Units.........................................................................................140
Hardware I/O .........................................................................................................................140
Digital Outputs ........................................................................................................140
Digital Inputs...........................................................................................................141
Input Interrupt Function ..........................................................................................142
Analog Inputs ..........................................................................................................142
Extended I/O of the DMC-3425 Controller...........................................................................143
Configuring the I/O of the DMC-3425....................................................................143
Saving the State of the Outputs in Non-Volatile Memory.......................................144
Accessing Extended I/O ..........................................................................................144
Interfacing to Grayhill or OPTO-22 G4PB24 .........................................................145
Example Applications............................................................................................................145
Wire Cutter..............................................................................................................145
A-B (X-Y) Table Controller....................................................................................146
Speed Control by Joystick.......................................................................................148
Position Control by Joystick....................................................................................149
Chapter 8 Hardware & Software Protection 151
Introduction ...........................................................................................................................151
Hardware Protection ..............................................................................................................151
Output Protection Lines...........................................................................................151
Input Protection Lines .............................................................................................152
Software Protection ...............................................................................................................152
Example:..................................................................................................................152
Programmable Position Limits................................................................................152
Example:..................................................................................................................153
Off-On-Error ...........................................................................................................153
Examples:................................................................................................................153
Automatic Error Routine .........................................................................................153
Example:..................................................................................................................153
Limit Switch Routine ..............................................................................................154
Chapter 9 Troubleshooting 155
Overview ...............................................................................................................................155
Installation .............................................................................................................................155
Communication......................................................................................................................156
Stability..................................................................................................................................156
Operation ...............................................................................................................................156
Chapter 10 Theory of Operation 157
Overview ...............................................................................................................................157
Operation of Closed-Loop Systems.......................................................................................159
System Modeling...................................................................................................................160
Motor-Amplifier......................................................................................................161
Encoder....................................................................................................................163
DAC ........................................................................................................................164
Digital Filter ............................................................................................................164
ZOH.........................................................................................................................165
System Analysis.....................................................................................................................165
System Design and Compensation.........................................................................................167
The Analytical Method............................................................................................167