Sto - Creating Schematic And Block Diagrams; Generating A Schematic Diagram; Fig. 9 Sto - Schematic Diagram - Pilz Intern PMC SR6 Manual

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11.3.1 STO – Creating schematic and block diagrams
In order to be able to calculate the protective measures suited for a system, start by generating a
schematic diagram of your system with all relevant components. Safety-related block diagrams can
then be derived from this schematic diagram.
11.3.1.1

Generating a schematic diagram

The following graphic shows uses the implementation of the STO safety function in conjunction with a
movable, separating safety device with position switch as an example. The safety function is triggered
by opening the safety door.
The schematic diagram includes the wiring of the position switch, the connection of the STO
STO inputs, a safety relay and a controller. Moreover, it illustrates the interaction between the sensor
b
technology and logic.
Open
Close
d
Confirmation
Fig. 9: STO – Schematic diagram
B1, B2
K1
K2
T1
4
Schematic diagram and accompanying explanation are based on an IFA report, 07 / 2013, p. 64ff.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
4
K2
B1
B2
K1
Safety
relay
Position switches
Safety relay
Controller
Drive controller with integrated PMC SR6 safety module
Inputs
PLC
Outputs
13 23
14 24
and
a
T1
Drive controller
STO
status
Set value
Enable
STO
a
STO
b
M
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