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70 CAS User’s Guide
Troubleshooting
Digital Output Test
Test digital outputs this way:
1. Connect a 500 ohm to 100 Kohm resistor between the +5V pin
(TB-50 screw terminal 1) and the output pin you want to test.
2. Connect the Common lead to the output pin.
3. Connect the voltmeter positive lead to the +5V pin.
4. If you are testing a digital output, use the Manual I/O Test menu to
turn the output on and off. (See Chapter 4: Setup for information on
the Manual I/O Test menu.)
Digital Input Test
Test digital inputs this way:
1. Go to the digital input test menu (under the Manual I/O Test main
menu). This menu shows whether the digital inputs are H (high, or
open) or L (Low, or closed).
2. Attach a wire to the terminal of the digital input you want to test.
•
When the wire is connected only to the digital input terminal,
the digital input test menu should show that the input is H
(High, or open).
•
When you connect the wire to logic ground (TB-50 pin 3), the
digital input test menu should show that the input is L (Low,
or closed).
- 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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