S7-PCI315:Read State

Read current state with SFC1011

The state of the internal battery of S7-PCI315, the existence of a SD card and the current power source can be read with a special SFC. A Library for STEP®7 can be found in the installation folder.

Read State SFC

CALL SFC 1011

ENABLE_ADC	:= TRUE	//INPUT BOOL
RET_VAL	:= MW 0	//RESULT INT
STATUS	:= MW 2	//OUTPUT WORD
VOLTAGE	:= MW 4	//OUTPUT WORD
SERIAL_NUMBER	:= MD 6	//OUTPUT DWORD
DEVICE_NUMBER	:= MD 10	//OUTPUT DWORD

Parameter	Type of data	Description
ENABLE_ADC	BOOL	Start of battery voltage measurement with a positive edge. The measurement should not be done too frequently, because every measurement requires a litte amount of energy from the battery.
RET_VAL	INT	Always 0
STATUS	WORD	Bit 0 = 1 if Micro-SD card is inserted Bit 1 = 1 if the PLC has been started without program Bit 2 = 1 if the PLC program has been loaded from the battery buffered SRAM Bit 3 = 1 if the PLC programm has been loaded from internal flash Bit 4 = 1 if the PLC programm has been loaded from the Micro-SD card Bit 5 = 1 if power supply from the PC is detected Bit 6 = 1 if an external 24V power supply is detected Bit 7 = 1 if the PCI bus is active Bit 8 = 1 if battery voltage measurement is completed
VOLTAGE	WORD	Analog value of battery voltage, valid for one cycle when the measurement has been completed
SERIAL_NUMBER	DWORD	Serial number of the card
DEVICE_NUMBER	DWORD	Order number of the card

Status word

If successful the BR of the status word is set, OR, STA and /FC are zero.

If failed the BR, OR, STA and /FC of the status word are zero.