Safety Integrated - Industry - Siemens

FC "STANDARD" (FC 3)
The FC "STANDARD" (FC 3) in the following figure sets/resets
#COND whose information starts or stops the "machine" in the
failsafe program.
#START
#STOP
"P"
P &
#E_MAGNET
"N"
N
"INSTANZ_
FB1".
RELEASE
>=1
"SR"
SR
S
R Q
#COND
=
"INSTANZ_FB1".RELEASE is a bit from the instance data block
(DB 1) of the FB 1, which is processed in the safety program.
The static variable "RELEASE" is set or reset. Here in FC 3 the
standard user program will read this information, as the machine
must only be operated with "RELEASE"="1".
The failsafe program has the following program sequence:
F-CALL
(FC1) FB"COORDINATION"
(FB1,DB1)
FB"F_SFDOOR"
(FB217,DB217)
From the
Distributed Safety
library
FC"REINTEGRATION"
(FC2)
F-CALL (FC1)
F-CALL (FC1) is the F runtime group and is called from the cyclic
interrupt OB (OB35). F-CALL calls the F programe block
(here the FB 1).
FB "F_SFDOOR" (FB217, DB217)
FB "COORDINATION" (FB1, DB1) is the first to call the FB
"F_SFDOOR" (FB217, DB217). FB 217 is a certified block from
the library of distributed safety, which from version 5.3 on is
available for safety door monitoring.
G_FB_XX_100
G_FB_XX_102
...
"SEP_ACT"
"HINGED_SW"
"F00002
4_8_F_DI_
DC24V".
QBAD
"F00002
4_8_F_DI_
DC24V".
QBAD
#OPEN_NEC
#ACK_NEC
#ACK
EN
IN1
IN2
QBAD_IN1
QBAD_IN2
OPEN_NEC
ACK_NEC
ACK
"INSTANZ_
FB217"
"F_SFDOOR"
DIAG
ENO
Q #RELEASE
ACK_REQ #ACK_REQ
...
The enable signal Q (#RELEASE) decides whether
■ the actuator is switched on/off
■ whether the safety door must be opened
Enable is given at #RELEASE="1".
The inputs of the safety position switch "SEP_ACT" and the
hinge switch are allocated to the inputs IN1 and IN2 of the FB
217. As soon as one of the two inputs IN1 and IN2 has the signal
status "0", it is interpreted as opening the safety door. The
enable signal is thereby reset to '0'.
The enable signal can only be reset to 1 if:
■ prior to closing the door both inputs IN1 and IN2 have the
signal status 0 (safety door completely opened). This
uncovers the error of a broken actuator still in the position
switch despite of an opened door.
■ subsequently both inputs IN1 and IN2 take on signal status
1 (safety door closed)
■ an acknowledgement is given
Functional Example No. AS-FE-I-003-V10-EN 203
G_FB_XX_101
Ex. No.
3