Safety Integrated - Industry - Siemens

Ex. No.
3
Sample Code
Preliminary Remarks
Enclosed, we offer you the STEP 7 project as sample code with
which you can reset the described emergency stop functionality.
The sample code is always assigned to the components used
in the functional example and implements the required functionality.
Problems not dealt with in this document are to be
implemented by the user; the sample code may serve as a basis.
Password
In all cases, the passwords used for the safety-relevant part is
„siemens“.
Use of the STEP 7 Project
The STEP 7 project shows the possibility of a safety door locking
in safety category 4. In this example, the hazardous machine
is simulated by an indicator light. The conditions necessary
for the actuators to reach safety category 4 (e.g. read
back of actuator signals) are not considered in this example.
Note
With this example, no real machine is controlled. The indicator
lights simulate the state of a hazardous machine
activity. The state "Machine in STOP" or "Machine in
RUN" is simulated by a (NO) push button
("0" signal means: "Machine in STOP").
Download
The download is available via the following link:
http://support.automation.siemens.com/WW/view/en/
21064258
To call the corresponding project file, open the
"as_fe_i_003_v10_code_sdoormag.zip " file offered as a separate
download (on the HTML page) and extract it into a user
defined directory. For downloading the project into the F-CPU
please proceed as follows:
■ First load the hardware configuration into the S7-CPU
■ Switch to the SIMATIC Manager
■ Select the "Blocks" container
■ Menu "Options" -> Edit safety program
■ Click the "Download" button
202 Functional Example No. AS-FE-I-003-V10-EN
The sample code with the given configurations enables the
following:
■ A safety door is guard locked until the hazardous action
(example of a "machine" in RUN) is over.
■ The safety door is interlocked and unlocked by setting/resetting
a failsafe module (F-DO) of the ET 200S.
Program procedure
The (non-failsafe) FC "STANDARD" (FC 3) is called from OB 1
(see following figure).
...
"START"
"E_MAGNET"
"STOP"
EN
START
E_MAGNET
STOP
"STANDARD"
COND
ENO
"COND"
Parameter Adress Explanation
START E 0.1 Push button (NO) for the start requirement.
E_MAGNET E 0.0 Position monitoring of the unlocking
magnet in the safety position switch.
STOP E 0.2 Button (NC) for the stop requirement.
COND M 90.0 Saves the information start/ stop of
the "machine".
The information of the memory bit "COND" is read as memory
bit COND1 in the safety program. This allocation occurs in the
cyclic interrupt OB35 for the following reason:
When reading data, which may be changed by the standard
user program or an operation control and monitoring system
during running of an F runtime group, from the standard user
program (memory bits or PAE of standard I/O), in the safety
program, it is necessary to use separate memory bits (here
COND1). Data from the standard user program have to be
written to these memory bits immediately before calling the F
runtime group. Only these memory bits may then be accessed
in the safety program.
In this example it has already been implemented. Generally,
however, the following applies:
Note
If the above section is not observed the F CPU may go to
STOP mode.
G_FB_XX_099