Siemens S7-300F-2 PN, DP specification

Industry Automation and Drive Technologies - SCE

Control bits from Bit0 to Bit7

Variable	Description

cancel	True =interruption of a current command or a command string. FB45 then sets the
	variable ready.
	MOBY U/D or RF300: the variable ‘cancel’ is not available. A command has to be
	canceled with the variable init_run.
command_start	True = start of a command or a command string
repeat_ command	True = command repetition: The command or command chain stored last in the IM is
	reprocessed with the next MDS. However, command processing for the MDS is
	started only after the MDS that was processed has exited the transmission window
	(ANZ_MDS_present= 0) and a new MDS has entered the transmission window of the
	reader (ANZ_MDS_present: 0 → 1).
	False = no command repetition, or command repetition is stopped after the command
	that was started with the repeat command is processed. Please note that the user
	has to reset this bit in order to stop command repetition. The result of the command
	repetition is fetched by the use setting command_start.
	Repeat_command is not reset automatically by FB45 after the command is
	processed.
	The commands init_run and cancel reset the variable repeat_command. This also
	interrupts a command repetition in the IM. repeat_command can be set again by the
	application with the next command_start. Handling of command repetition is described
	in the chapter "Command Repetition“.
Init_run	True = IM restart. In this case, FB45 is also reset and the IM re-parameterized. All
	data and commands in the IM are lost. This bit has to be set in the restart OB (OB100)
	for each MOBY channel or IM.
	After a MOBY-IM fault, the error error_MOBY=0F is indicated to the user. The user
	then has to perform an init_run.
	Please note:
	• When loading a parameter data block from the programming device to the
	SIMATIC, bit init_run is pre-assigned TRUE. The result is the automatic
	execution of an IM restart.
	• The time to execute init_run is normally in the millisecond range. If there is
	an error, this time may extend to 15s.
IM_failure	True = the IM failed. The user sets this bit in OB122 (refer to chapter "Programming
	Module Failure“). FB45 then signals an error to the user (error_FB = 09) and
	interrupts the current command. If the user does not program OB122, the PLC enters
	the STOP mode if the IM fails.
FB45_active	FB45 is just processing a command. This variable is set when the command is started
	(command_start=True) and remains active until
	• FB45 has received the last acknowledgement from the IM
	• The init_run bit was set
	• The cancel bit was set
	• The IM signaled an error
ANZ_next	This bit is set if the command executed last was a NEXT command
ANZ_reset	This bit indicates that the command executed last was a RESET. The user started the
	RESET command with "init_run“.

Notes

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TIA Training Document	Page 47 of 65
Module E11
Status: 01/2010	Radio Frequency Identification (RFID) with SIMATIC S7-300F-2PN/DP and
RF180C