# irc5 supply error on i/o module **URL:** \ **Category:** Robot Controller\ **Tags:** error-handling\ **Created:** [June 9, 2017, 5:25pm UTC](https://tech-community.robotics.abb.com/t/irc5-supply-error-on-i-o-module/7764 "2017-06-09T17:25:40Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![aftab\_khan](https://avatars.discourse-cdn.com/v4/letter/a/e36b37/32.png) [@aftab\_khan](https://tech-community.robotics.abb.com/u/aftab_khan)\ **Post date:** [June 9, 2017, 5:25pm UTC](https://tech-community.robotics.abb.com/t/irc5-supply-error-on-i-o-module/7764/1 "2017-06-09T17:25:40Z")
Hi i m facing a problem in irc5 controller, "devicenet bus failure error " is displayed in the log. there is no 24v at the end of DNet card but the HLT led of DNet card is green also “Comm” led is off. 24 v supply is also not present across pin 1 and 5 of DNet connector. communication cable is ok. and no led is glowing on the i/o module. any help please. ---
**Author:** ![graemepaulin](https://avatars.discourse-cdn.com/v4/letter/g/258eb7/32.png) [@graemepaulin](https://tech-community.robotics.abb.com/u/graemepaulin)\ **Post date:** [June 11, 2017, 7:57pm UTC](https://tech-community.robotics.abb.com/t/irc5-supply-error-on-i-o-module/7764/2 "2017-06-11T19:57:36Z")
Is this a new installation or has it being running and now has this fault? The DeviceNet needs to be connected to 24 VDC - pin 1 = 0 V and pin 5 = 24 V. COMM LED is indicating not communicating on the network - have you setup the board in the EIO config file? ---
**Author:** ![Kadian\_Rakesh](https://avatars.discourse-cdn.com/v4/letter/k/b5ac83/32.png) [@Kadian\_Rakesh](https://tech-community.robotics.abb.com/u/Kadian_Rakesh)\ **Post date:** [July 3, 2017, 10:59am UTC](https://tech-community.robotics.abb.com/t/irc5-supply-error-on-i-o-module/7764/3 "2017-07-03T10:59:18Z")
You need to have 24V power first on device net network pin 1 & 5. Also It is recommended to provide as much information as possible to get an better reply. ---
**Author:** ![Kadian\_Rakesh](https://avatars.discourse-cdn.com/v4/letter/k/b5ac83/32.png) [@Kadian\_Rakesh](https://tech-community.robotics.abb.com/u/Kadian_Rakesh)\ **Post date:** [July 3, 2017, 10:59am UTC](https://tech-community.robotics.abb.com/t/irc5-supply-error-on-i-o-module/7764/4 "2017-07-03T10:59:33Z")
It is recommended to provide as much information as possible to get an