SLC 500 troubleshooting 

Basic troubleshooting 

• Ensure the card is slid into the rack allowing both bottom and top clips to lock into place 

• Check that the entire rack has power  

• Allow a 1-5 min power cycle 

• Check pins on the back side of the card where a connection is made into the rack 

• Take the card out and do a visual inspection of the card outside of the rack, checking that resistors, capacitors, TRIACs and chips all look functional 

• Check to see that power supply is screwed into the rack and properly mounted 

Processor Communications 

• Make sure your RS-232 cable is making a good connection with both the computer and processor 

• Check that the proper COMM port and driver is being used in RS-Linx 

• For SLC 5/03 and up apply screwdriver across GND and VBB for 1 min, this will reset COMMS 

Read I/O configuration 

• Check to ensure you are reading the correct driver in rs-linx 

• Research error codes 

Rack not powering on 

• Check power supply 

• Try inserting power supply into another rack 

• Check voltage going into power supply and ensure correct sumpers are selected if there any 

• Check pins on the back slide of the power supply that plug into the rack 

• Check manual for proper insulation and power requirements for multiple power supplies 

• Add your amperage rating for each device 

If the rack is still not powering on, the application you are using could require more amperage than the supply is rated for

Example: 

The 1747-L551 draws 1A at 5v DC 

The 1746-OV16 requires 0.270 A according to documentation  

The 1746-P2 supplies 5A at 5vDC to the backplane 

Checking to see if our power supply can handle the load we would use the following formula: 

IT=I1+I2+I3

Using this formula, we can see that since 1a + .27a = 1.27a ,

the 1746-P2 would handle this load no problem   

If none of these solutions solve the problem, there could be a faulty card killing your whole rack

• Remove each card one at a time to check if there is a card causing issues in the rack