Safety Integrated - Industry - Siemens

Ex. No.
9 Sample Code
Preliminary Remarks
Enclosed, we offer you the STEP 7 project as sample code with
which you can reset the functionality described here.
The sample code is always assigned to the components used
in the functional examples 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
Two three-phase asynchronous motors can be started independently
of one another with separate push buttons (NO).
The motors are either safely stopped:
1. individually (respectively one emergency stop button assigned
to one group) or
2. as group shutdown. An emergency stop button exists that
switches off all groups (stopping all motors).
Download
The download is available via the following link:
http://support.automation.siemens.com/WW/view/en/
21330890
To call the corresponding project file, open the
"as_fe_i_009_v10_code_singlegroup.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
The sample code with the given configurations enables the
following:
■ Independent starting of two motors M1 (group 1)and M2
(group 2).
■ Safe shutdown of individual groups (motor M1 and/or M2)
■ Group shutdown for both motors (M1 and M2)
288 Functional Example No. AS-FE-I-009-V10-EN
Note
Operational stopping has not been prepared in this
example.
Program procedure
The standard user program consists of two networks of OB 1.
Network 1
"START_M1"
"INSTANZ_
FB1".EN1
"INSTANZ_
FB1"
ERROR1
The signal for operational starting (START_M1) for group 1
consisting of motor M1 is given in network 1.
The "INSTANZ_FB1".... ensures that the motor cannot be
started with an acknowledgement transmitted in the safety
program. As long as on of these bits is "0", COND1= "0" remains
true also if the start button is pressed, since the reset
function has priority in this flip-flop type.
Network 2
"START_M2"
"INSTANZ_
FB1".EN2
"INSTANZ_
FB1"
ERROR2
"P1" "SR1"
P
SR
S
>=1
R Q
"P2" "SR2"
P
SR
>=1
"COND1"
=
"COND2"
=
Basically the above information on network 1 applies to group
2 with motor M2.
The information of the flags "COND1" and "COND2" from the
networks 1 and 2 is read in the safety program as flag
COND1_F or COND2_F. This allocation occurs in the cyclic interrupt
OB 35 for the following reason:
If you want to read data from the standard user program (flags
or PII of standard I/O) in the safety program (here: COND1 or
S
R Q
G_FB_XX_171
G_FB_XX_172