Safety Integrated - Industry - Siemens

FB "SET_ACT" (FB 3, DB 3)
Network 1
#ACK
The status of the SR flip-flop (#EN) is evaluated in OB 1 as a
precondition for a start command. In case of a detection zone
violation OSSD becomes "0" and resets the SR flip-flop as well
as the #RELEASE (used in network 2).
Note
For this type of flip-flop it is reset if the S input and the
R input are controlled with a "1" signal (resetting has priority).
Network 2
#COND1
#RELEASE
#N #EN
N SR
S
#OSSD
R Q
The actuator (here simulated by an indicator light) only becomes
active if
■ the start condition could be transmitted (see OB 1 or
OB 35) and
■ an enable was given (see previous network 1)
FB "FIELD_PAIR_SWITCHING" (FB 4)
The following table describes the parameters.
&
#RELEASE
=
#ACTUATOR
=
Parameter Input / output Convention
SEN_FIELD1 Position switch (NC) "1": Switch not activated
SEN_FIELD2 Position switch (NC) "1": Switch not activated
SEN_FIELD3 Memory bit Dummy
SEN_FIELD4 Memory bit Dummy
FIELD_BIT0 Bits of the cyclic output –
FIELD_BIT1
FIELD_BIT2
data
A maximum of four zone pairs (one zone pair consists of a
safety and a warning zone) can be actively switched. However,
only one zone pair must be active at any time. In this example
zone pair 1 or 2 can be active. Zone pair 3 and 4 are not
G_FB_XX_189
G_FB_XX_190
ready. If you also wish to use these zone pairs, replace the
memory bits (in this example the dummys) by sensors (e.g.
further position switches). These zone pairs 3 and/or 4 must
previously have been configured with the LS4Soft software.
In the prepared example, it can be switched from zone pair 1
to 2 and from zone pair 2 to 1. Which zone pair is now active
depends on bits 0, 1, 2 of the cyclic output data (parameter
"FIELD_BIT0", "FIELD_BIT1", "FIELD_BIT2").
Note
When switching the zone pairs, the PC adapter must not
be connected (PC adapter must not be connected at the
LS4).
7
Cyclic
output data
0
The following assignments apply:
FIELD_BIT0
FIELD_BIT1
FIELD_BIT2
FIELD_BIT2 FIELD_BIT1 FIELD_BIT0 Active
zone pair
0 0 1 1 –
0 1 0 2 –
Note
0 1 1 3 Not real-
1 0 0 4
ized in the
example
The statuses of these three bits are determined by the status
of the position switches (SEN_FIELD1 and SEN_FIELD2). The
realization in the program code is displayed below.
Functional Example No. AS-FE-I-010-V11-EN 313
G_FB_XX_191
Ex. No.
10