Siemens S7-300F-2 Manual do Utilizador descarregar pdf (Página 47)

Industry Automation and Drive Technologies - SCE

TIA Training Document

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Module E11

Status: 01/2010 Radio Frequency Identification (RFID) with SIMATIC S7-300F-2PN/DP and

RF180C

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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