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NULL DRIVE
This field displays the amount of drive in millivolts that it takes to hold the ACTUAL
POSITION at the TARGET POSITION while at rest. Ideally this number should be zero
if the valve is perfectly nulled. This field is automatically updated toward the Integral
Drive when the ACTUAL POSITION is exactly equal to the COMMAND POSITION
and the speed is zero.
This field is only used in open loop mode. NULL DRIVE gets added to the drive output.
Why Bother?
The NULL DRIVE field can be used to null valves and drives. Usually there is a null or
offset adjustment on the valve or amplifier that can be adjusted so the NULL DRIVE is 0.
STEP
This field shows the current step the axis is executing of the 256 steps in the Event Step
Table. This is valid only when Event Control is being used. Use this field in conjunction
with the Link Value status word to monitor the progress of an axis through the step table.
LINK VALUE
This field is used only when the axis is using the Event Step Table. It represents the
current event step link value of the current step for the axis. The current step is displayed
in the STEP status word.
For delay link types (types ‘D’ and ‘d’), this field displays the number of delay units left
(in either counter ticks or milliseconds).
Appendix E: Event Step Link Reference
Link Types and Link Values
Link Type and Link Value specify the condition that causes the motion controller to
execute the next step in a sequence. These fields may be edited manually; however in
most cases it is easier to use the Popup Editor. Start the popup editor by pressing Enter
in, or double-clicking on, either the Link Type or Link Value field.
The Link Type and Link Value dialog box divides the link types into three categories:
•System-wide (Basic, non-axis dependent)
These link types allow the axis to wait on a global condition such as a time delay.
These link types are listed below; select a link type for further details:
- DCS120-Win Software 1
- User Manual 1
- Table of Contents 2
- Introducing the MMC120 7
- MMC120 Overview 7
- Disclaimer 7
- Principle of Operation 9
- Starting Up the MMC120 11
- Step-by-Step MMC120 Startup 11
- Setup Details 15
- Using DCS120-Win 20
- DCS120-Win Overview 20
- Screen Layout 21
- Command area 22
- Parameter area 23
- Plot Time area 24
- Status area 24
- Status Bar 24
- Basic Topics 26
- Read-back versus Write Mode 27
- Using Popup Editors 28
- Using the STATUS Bits Window 28
- Using the Command Log 29
- Using Stored Commands 31
- Setup Options 32
- Using Multiple Motion Modules 33
- Creating a New Board File 33
- Changing Between Board Files 34
- Using Plots 37
- Selecting the Data to Plot 38
- Using the Plot Detail Window 38
- Viewing the Raw Plot Data 39
- Saving and Restoring Plots 40
- Printing a Plot 40
- Plot Time 41
- Table Editors 42
- Editing the Profile Table 44
- Editing the Event Step Table 44
- Advanced Topics 47
- Forcing Initialization 48
- Using Look-only Mode 48
- Using PC Mode 48
- Command Line Options 49
- Options Dialog Box 50
- Controller Features 51
- Event Control Overview 51
- FLASH Memory 53
- LED Indicators 54
- Motion Profiles 55
- Synchronizing Axes 57
- Two per unit 60
- Communicating with the MMC120 61
- Input Register Overview 63
- Output Register Overview 64
- 1514131211109876543210 65
- SAR Type Index 65
- Support and Troubleshooting 66
- Warranty 66
- Troubleshooting 66
- Error Handling 67
- MMC120 Module Problems 67
- Hydraulic System Problems 69
- Technical Support 73
- Parameter Errors 74
- Invalid command received 76
- Appendix A: Command Reference 78
- General ASCII Commands 78
- Start Events Command 79
- Set Feed Forward Command 79
- Go Command 79
- Halt Command 80
- Set Integral Drive Command 80
- Relative Move Command 81
- Disable Drive Output Command 81
- Set Mode Command 82
- Set Null Drive Command 82
- Open Loop Command 82
- Set Parameters Command 84
- Quit Events Command 84
- Restore Null Drive Command 84
- Save Null Drive Command 85
- Save Integral Drive Command 85
- Update FLASH Command 85
- Set Speed (Unsigned) Command 86
- Set Speed (Signed) Command 86
- Start a Graph Command 86
- Go Using Profile Commands 87
- Set Profile Commands 88
- Set Parameter Commands 90
- ASCII Commands 91
- Get Profile Commands 93
- 0xAC-0xAF 37 94
- Get Parameter Commands 95
- Event Step Edit Commands 97
- LINK TYPE/NEXT 98
- Diagnostics Command 98
- Event Step Transfer Command 99
- MODE Word Bit Map 103
- ACCELERATION 104
- DECELERATION 104
- COMMAND VALUE 105
- Command Field 106
- CONFIGURATION Word 107
- CONFIGURATION Word Bit Map 109
- SCALE Calculation Examples 111
- EXTEND LIMIT 112
- RETRACT LIMIT 113
- PROPORTIONAL GAIN 113
- INTEGRAL GAIN 114
- DIFFERENTIAL GAIN 115
- EXTEND FEED FORWARD 115
- RETRACT FEED FORWARD 116
- DEAD BAND ELIMINATOR 117
- IN POSITION 118
- FOLLOWING ERROR 118
- AUTO STOP 119
- AUTO STOP Bit Map 120
- Valid 16-Bit Positions 121
- COMMAND POSITION 122
- TARGET POSITION 123
- ACTUAL POSITION 123
- TRANSDUCER COUNTS 124
- AXIS STATUS Word 124
- STATUS Word Bit Map 128
- ACTUAL SPEED 129
- NULL DRIVE 130
- LINK VALUE 130
- Link Types and Link Values 130
- Link Next 131
- System-wide Link Types 132
- Current Axis Link Types 132
- Link Type and Link Value 133
- Selected Axis Link Types 135
- Link Type - Any Axis Speed 136
- MMC120 Specifications 138
- Appendix G: Glossary 139
- Glossary 139
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