Safety Integrated - Industry - Siemens

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 FC 2).
FC "2H_and_ESTP" (FC 2)
FC 2 ensures the modular setup of the safety program.
The "two-hand control" functionality is basically implemented
in the function blocks FC3, FC4 and FC5, FC6 called by FC2.
Block Task
FC "2Hand" (FC 3) Evaluation of the status of the two exclusive
OR sensors of the two-hand control
panel.
FC "E_STOP" (FC 4) Evaluation of the status of the emergency
stop mushroom-head push button integrated
in the two-hand control panel.
FC "START" (FC 5) Evaluation of the information from FC3 and
FC4 to start the "machine".
FC "REINTEGRATION"
(FC 6)
FC "2Hand" (FC 3)
Reintegration after passivation of F-DI or F-
DO.
Input
parameter
Assignment Function
HAND1 Exclusive OR Starting the "machine". To start the
HAND2
sensor of the
two-hand
machine both exclusive OR sensors
must be pressed simultaneously
control panel and have to remain pressed during
the entire "machine time".
Output
parameter
HELP_DB1.CO
ND1
Assignment Function
Bit from F-DB Storing the result for later evaluation
in FC5
For realisation of the "two-hand control", FC 3 calls the FB
"F_2H_EN" (FB 211, DB 211). FB 211 is a certified block from
the Distributed Safety library.
...
#HAND1
#HAND2
"HELP_
DB1".
EN_ESTP
T#500MS
EN
IN1
IN2
ENABLE
DISCTIME
"INSTANZ_
FB211"
"F_2H_EN"
Q
ACTUATOR
ENO
#01
...
G_FB_XX_139
In #HAND1 and #HAND2 the make contacts are polled by the
exclusive OR sensors of the two-hand control panel.
Both exclusive OR sensors have to be pressed within a time.
This time is indicated on the DISCTIME parameter of FB
"F_2H_EN" (FB 211). The maximum permissible value which
can be parameterized is 500 ms according to EN 574).
Only with "1"-signal at ENABLE, Q can be set. The bit
"HELP_DB1".EN_ESTP is the the emergency stop signal (see FC
4): "HELP_DB1".EN_ESTP will be set, if the emergency stop
button is unlocked and acknowledged. Consider the following
scenario:
■ Both exclusive OR sensors are pressed and will be pressed
all along
■ The emergency stop is pressed
■ The emergency stop is unlocked
■ An acknowledgement is done
Even though both exclusive OR sensors have been pressed
during those 4 steps, the "machine" will not turn on (a release
of the both exclusive OR sensors is necessary).
FC "E_STOP" (FC 4)
Input
parameter
ACK Push button
(NO)
ACK
ESTP Emergency
stop push
button
(NC/NC)
Assignment Function
An acknowledgement prior to the
start of the "machine" is required in
the following cases:
■ First start
■ After unlocking the
emergency stop
■ After the F-DI has come from
passivation (reintegration)
The ACK signal is received by a standard
DI. The signals which are not
failsafe are indicated in color
in the
F program.
Interruption of the "machine
activity"
Output
parameter
Assignment Function
HELP_DB1.COND2 Bit from F-DB Storing the result for later
evaluation in FC5
Functional Example No. AS-FE-I-006-V10-EN 243
Ex. No.
6