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52 CAS User’s Guide
Setup
Linear Scaling Menus
The linear scaling menus appear under the Setup Channel Inputs main
menu. Linear scaling is available for linear and pulse inputs only. It lets
you scale the "raw" input readings (readings in millivolts or hertz) to the
engineering units of the process variable.
NOTE
The linear scaling menus will only be present if you set the chan-
nel’s input type to Linear (or, for some menus, to Pulse).
For linear inputs, the input reading is in percent (-16.6 to 100%)
representing the -10 to 60 mV input range of the CAS. For pulse inputs,
the input reading is in hertz (cycles per second.) The scaling function is
defined by two points on a conversion line, the high PV and the low PV.
High PV is the high end of the input in engineering units, and the low
PV is the low end. The engineering units of the process variable can be
any arbitrary units.
The example below shows a high PV of 20 PSI and a low PV of 0 PSI.
The high reading is the high end of the input signal (where 60mV =
100%).
Before you enter the values that determine the two points for the
conversion line, you must choose an appropriate display format. The
CAS has six characters available for process variable display; select the
setting with the desired number of decimal places before and after the
decimal point. Use a display format that matches the range and
resolution of the process variable. The display format you choose is
used for the setpoint, alarms, deadband, and alarm deviation.
Process
V
ariable
InputR eading
20 PSI
0 PSI
0%
0mV
100%
60 m V
Lo
Rdg
Lo P V
HiPV
Hi
Rdg
- User ’s Guide 1
- Warranty 2
- Contents 3
- CAS User’s Guide iii 5
- Overview 7
- System Diagram 8
- Parts List 8
- 10
- Introduction 11
- Specifications 13
- Digital Inputs 14
- Digital Outputs 14
- System Digital Outputs 14
- Miscellaneous Specifications 15
- 6 CAS User’s Guide 16
- Installation 17
- Precautions and Warnings 18
- Recommended Tools 19
- CAS Mounting Procedure 20
- TB-50 Mounting Instructions 21
- Grounding 24
- Thermocouple Wiring 24
- Input Wiring 24
- Communications Wiring 25
- Wiring: Noise Suppression 26
- General Wiring 27
- Connections Test 28
- Wiring Outputs 29
- Using the Cable Tie Wraps 30
- Alarm Output Connections 31
- Watchdog Timer 31
- TB-50 Connections 32
- Input Scaling 33
- Scaling Values 34
- Scaling and Calibration 35
- T/C Inputs 36
- Connecting Thermocouples 36
- Current Inputs 36
- Voltage Inputs 37
- Unused Inputs 37
- Serial Communications 38
- JU 1JU 1 39
- Configuring Communications 40
- Recommended Wire Gauges 41
- 32 CAS User’s Guide 42
- Using the CAS 43
- Front Panel 44
- Single Channel Display 46
- Job Display 47
- Change Setpoint 48
- Acknowledging an Alarm 49
- Resetting an Alarm 49
- 40 CAS User’s Guide 50
- How to Enter the Setup Menus 51
- How to Edit a Menu 51
- CAS Menus 52
- Setup Global Parameters Menu 53
- Save Setup to Job 54
- Job Select Inputs 54
- Job Select Input Polarity 55
- Startup Alarm Delay 55
- Keyboard Lock Status 56
- Scanner Address 56
- Communications Error Checking 56
- Communications Baud Rate 57
- Allen-Bradley Protocol 57
- AC Line Frequency 57
- Digital Output Polarity 58
- EPROM Information 58
- Setup Channel Inputs 59
- Pulse Sample Time 60
- Channel Name 60
- Input Units 61
- Input Reading Offset 61
- Linear Scaling Menus 62
- Variable 63
- InputR eading 63
- Display Format 64
- High Process Value 64
- High Reading 65
- Low Process Value 65
- Low Reading 66
- Input Filter 66
- Setup Channel Alarms 67
- Alarm Delay 69
- High Process Alarm Setpoint 69
- High Process Alarm Type 69
- Deviation Alarm Value 70
- High Deviation Alarm Type 70
- Low Deviation Alarm Type 71
- Low Process Alarm Setpoint 72
- Low Process Alarm Type 72
- Alarm Deadband 73
- Manual I/O Test 75
- Digital Output Test 76
- Keypad Test 76
- Troubleshooting 77
- Manual System Reset 78
- Returning the Unit 78
- TB-50 Test 79
- Checking an Analog Input 79
- Checking Digital I/O 79
- Digital Input Test 80
- Computer Problems 81
- Ground Loops 82
- Software Problems 82
- User-Written Software 82
- Changing the EPROM 83
- Appendix: Linear Scaling 85
- Examples 85
- Example 2 86
- Example 3 87
- 78 CAS User’s Guide 88
- Glossary 89
- 88 CAS User’s Guide 98
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