Rockwell Automation 1784-KTXD User Manual download pdf (Page 128)

Publication 1747-UM011F-EN-P - May 2007

128 Starting Up Your Control System

Input Troubleshooting Steps

1. Make sure the processor is in the Continuous Scan Test mode.

2. If associated bit status and status indicator status do not match

the input device status, check status file S:11 and S:12 I/O slot

enables. Bits S:11/0 through S:11/15 and S:12/0 through S:12/14

should all be 1, enabling all I/O slots for the modular system.

3. Verify proper control power to the input device.

4. Remove the input device power and make sure circuit

terminations are properly wired and tightened.

5. Re-energize the input device power, and check for proper

control voltage between the input terminal and signal common

terminal.

6. If proper input control voltage does not exist, first check

minimum signal common by verifying voltage between input

device power source and the input common terminal.

7. If proper input voltage does exist, first check the minimum input

current specification on the input module, and then measure the

current in the input circuit. Replace the input module if

necessary.

8. If the input modules are OK, and proper voltage is measured

between input device source and input module common

terminal, test the input device and replace if necessary.

For more information on input troubleshooting see page 166.

5. Test Your Outputs

After you test all inputs, and have determined that they are

functioning properly, test the outputs.

1. Refer to page 124 to insure no motion will occur when any

controller output is energized.

2. Place the controller in the Program mode.

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Rockwell Automation 1784-KTXD User Manual Page 128