Safety Integrated - Industry - Siemens

Ex. No.
5
For calculating the max. reaction time of your F-system please
use the Excel file (Cotia table), which is available for S7 Distributed
Safety V 5.3. This file is available on the internet:
http://support.automation.siemens.com/WW/view/en/
19138505
Muting
In this example we show parallel muting. Muting is an intended
suppression of the protective function. This is e.g. required
during transporting the material into the danger zone.
Muting is triggered by muting sensors. In this example, FB189
(F_MUTING) is called in the F program (FB 1, DB 1). Among
other things, FB189 as input parameter has the signals of the
four muting sensors (MS_11...MS_22) as well as three parameterizable
times (DISCTIM1, DISCTIM2; TIME_MAX).
MS_11
MS_12
If the muting sensors MS_11 and MS_12 are activated by the
product within the time DISCTIM1, the muting mode is activated.
MS_11
MS_12
Sender
Receiver
Sender
Receiver
MS_21
MS_22
MS_21
MS_22
Hazardous Area
Hazardous Area
The muting mode remains active as long as MS_11 and
MS_12 are activated by the product. The product may pass the
light curtain without causing a stop of the machine.
220 Functional Example No. AS-FE-I-005-V10-EN
G_FB_XX_118
G_FB_XX_119
MS_11
MS_12
Sender
Receiver
MS_21
MS_22
Hazardous Area
Before the muting sensors MS_11 and MS_12 switch inactive,
the muting sensors MS_21 and MS_22 must have been activated
within the time DISCTIM2. This ensures that muting
mode remains active.
The muting mode is terminated, if one of the muting sensors
MS_21 or MS_22 is switched inactive by the product. The
maximum time for the muting mode to be active is
TIME_MAX.
Note
Muting mode also becomes active if the muting sensors
MS_21 and MS_22 respond first.
Active muting operation is indicated by white indicator lights.
In this example, one indicator light is used to display the muting
mode. The diagram below illustrates the relations during
muting mode with regard to time.
MS_11
MS_12
MS_21
MS_22
MS_11
MS_12
t < DISCTIM1
MUTING
Sender
Receiver
MS_21
MS_22
t < DISCTIM2
t < TIME_MAX
Hazardous Area
G_FB_XX_120
G_FB_XX_121
G_FB_XX_122