User alerts comply with the widely accepted NAMUR NE107 standard on "self-monitoring and diagnosis of field devices". On the one hand, a blue LED on the I/O module is used to show "Maintenance" requirement on location. A diagnostic message is also passed on to control and asset management systems. The blue maintenance message with the defined symbol and an explanatory text appears in the IS1+ DTM. In addition to maintenance notifications, IS1+ intelligent diagnostic functions provide a range of other information. For instance, signal errors are reported via red LEDs for specific channels as well as via error telegrams. Moreover, for IS1+ for PROFIBUS DP in particular, application creation in the control system is facilitated through a signal status bit – much like the status byte for systems such as PROFIBUS PA, it serves to supplement 'good' or 'bad' (for example, in case of line errors) status information that is cyclically transmitted for each process value.
• Stahl products are marketed in Ireland by Douglas Controls & Automation.
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