The values of M8004, M8037, M8061, M8066 in PLC program?

M8004 is an error alarm. When an error occurs in the PLC, such as power failure, hardware error, parameter, etc., M8004 is ON.
M8034 is all outputs in hexadecimal. When M8034 is ON, all outputs Y are stopped.
M8037 is forced STOP. When M8037 is ON, the status of the PLC is forced to STOP.
M8061 is a hardware error alarm.
M8066 is a loop error alarm.

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