Dic-4-002-c-0003-01 Manual -

| LED | State | Meaning | |------------|-------------|-----------------------------| | PWR (green)| Solid | Power OK | | | Off | No power | | RDY (yellow)| Slow flash | Standby | | | Fast flash | Active I/O | | ERR (red) | Solid | Internal fault | | | 1 flash/sec | Communication error |

It could be a Standard Operating Procedure for Data Handling . dic-4-002-c-0003-01 manual

For inductive loads (relays, solenoids), the manual strongly recommends external flyback diodes across the load to prevent voltage spikes from damaging the card's internal circuitry. dic-4-002-c-0003-01 manual