Siemens SIMATIC FS600 Instruções de Operação descarregar pdf (Página 37)

Distributed Use of SIMATIC FS600 Laser Scanner in

Category 3 / SIL 2

Entry ID: 21330889

A&D Safety Integrated Page 37/51 AS-FE-I-010-V20-EN

21330889_as_fe_i_010_v20_en_lscanner.doc

6.2 Program execution standard program

OB1

Network 1

Network 1 evaluates the conditions for an operational start or stop of the

“machine” (indicator light).

Parameter Explanation

START Push button (NO) for the start request.

STOP Push button (NC) for the stop request

INSTANZ_FB3.

The “INSTANZ_FB3”.EN bit includes the status of an SR flip-flop

in the safety program (FB3, NW1) and in this case prevents that

the “machine” (indicator light) can be started by an

acknowledgement generated in the safety program.

As long as “INSTANZ_FB3”.EN=“0”, COND= “0” remains true

because the reset function has priority in this flip-flop type.

COND Information for the safety program:

Start or stop of the “machine” (actuator or indicator light)

The "COND" memory bit is read as "COND1" memory bit in the safety

program. The allocation occurs in the cyclic interrupt OB35 for the following

reason:

If you want to read data from the standard program (memory bits or PII of

standard I/O) in the safety program (here: COND), which can be changed

by the standard program or an operator control and monitoring system

during the runtime of an F run-time group, it is required to use separate

memory bits (here: COND1). Data from the standard program have to be

written to these memory bits immediately before calling the F run-time

group. You are allowed to access these memory bits only in the safety

program. This is implemented in this way in the safety functional example.

Note

If the above section is not observed, the F-CPU may go to STOP mode.

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Siemens SIMATIC FS600 Instruções de Operação Página 37