# Reading B bits from SLC503, getting bad quality

**URL:** <https://forum.inductiveautomation.com/t/reading-b-bits-from-slc503-getting-bad-quality/73561>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 10, 2023, 7:39pm UTC](https://forum.inductiveautomation.com/t/reading-b-bits-from-slc503-getting-bad-quality/73561 "2023-05-10T19:39:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![CTrenkamp](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ctrenkamp/32/38440_2.png) [@CTrenkamp](https://forum.inductiveautomation.com/u/CTrenkamp)\
**Post date:** [May 10, 2023, 7:39pm UTC](https://forum.inductiveautomation.com/t/reading-b-bits-from-slc503-getting-bad-quality/73561/1 "2023-05-10T19:39:01Z")

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I am trying to read B bits from a SLC503 using a 485 converter, which I have used with many other PLC's, and getting bad quality but I can browse to the bits and select them in the OPC. It gives a result of B3:0/1 and I have tried B3:0.1 but no luck. I have seen in other posts that when reading I/O tags from certain PLC's and versions you have to make a manual change to the OPC selection to get it to work but have not found the same for this issue. Keep in mind it is only stating 'Bad' not 'Error Configuration' so it knows something is there. I can read other tags like integers, strings and I/O with no issue.