Created Date: August 03,2009

Created by: GKiser

RE: H2-ecom error bit reset?

The Error bit for the H2-ECOM (or for any communication device in the PLC slot) is reset to zero upon the next execution of a comm (e.g. RX/WX). In other words, the Error bit is not indicating the current status of the device in the slot, but rather indicating the last comm for that slot failed. Whenever you execute the next RX/WX for the device in that slot, the Error bit will be cleared.

This is why error checking logic for a particular comm must be done in the rung above that particular comm rung. If error checking logic is done below it, then it will never detect an Error because, as I said, that gets immediately cleared when the RX/WX is executed.

Bottom line: It is not possible to manually reset the SP-Error bits. The only way to clear SP-Error bits is to execute another comm (RX/WX).