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HA71 Digital Gas Controller
4.0 System Diagnostics
A System Diagnostic Mode shown in Figures 4-1 and 4-2 may be
entered during normal operation from the Setup menu. The entry menu
indicates firmware revision and offers useful routines for testing front
panel LED's, relays, serial ports and analog I/O. It is exited manually
by pressing NEXT, and automatically if no keys are pressed for 5
minutes.
CAutIoN
It is very important to understand that CHANNEL INPUT DATA IS NOT
PROCESSED DURING THE DIAGNOSTICS MODE. It is possible to miss
important input values while utilizing this mode and appropriate
safeguards should be in place. However, the Diagnostics Mode can
prove invaluable when testing I/O since relays and analog outputs
may be stimulated without driving inputs to precise levels.
HA71 Technical Manual
Figure 4-1. System Diagnostic Mode (Part 1)
4-2
Revision 3 (04/08)
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