Siemens EF 837 Series Dokumentacja Pobierz pdf (Strona 47)

Section 4 Operation S800 I/O Module LEDs

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• W - The WARNING LED shall indicate when a non-fatal error is detected and

the module continues to run.

• O - The OSP LED shall indicate when the I/O module is in OSP state, that is,

when the module is commanded to OSP or when automatically set to OSP state

due to communication error.

• PRIM - The PRIMARY LED shall indicate when the I/O module is primary

(in a redundant pair). In a redundant configuration, the primary module is

scanned at the specified cycle time to supply input values to the application,

while the backup module is scanned at a low cycle for diagnostic purpose. The

input values from the backup module are not used by the application.

Figure 14. Examples of S800 I/O Modules LED Locations

DO810 DI810

AI810

AO810/AO810V2

PX1

UP1

ST1

DI1

SY1

DO1

TP1

UL1

PX2

UP2

ST2

DI2

SY2

DO2

TP2

UL2

DP820

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Siemens EF 837 Series Dokumentacja Strona 47