7
Connection Examples
EDBC250SIO | 2.0
92
7.5
Safety Mats, Connecting Blocks and Bumpers
Safety mats protect operators in danger zones. Connecting
blocks and bumpers are normally used as safeguards along
closing edges or against potentially hazardous moving objects.
They share the same tripping method. Two parallel areas of
contact are kept at a certain distance and do not make contact
until the device is actuated. An electric current going through
the areas of contact ensures that they are ready for use. The
picture illustrates that one area of contact is allocated to one
channel and the other area to another channel. Mechanical
load on the area of contact makes the inputs connect. This is
not interpreted as a short circuit but as actuation. Use FSoE
parameter "External Input" to enable the "Bumper" function.
Refer to manual section
►
6.3.3 Input Parameters for further
details. This mode only supports pressure-sensitive mats
working according to the open circuit principle, i.e. the test
pulses required to maintain a safe function are supplied by the
safe I/O module.
The function uses either inputs SI0 and SI1 and/or inputs SI2 and SI3. The pressure-sensitive
mat function achieves a response time of 50 ms between a change in mat state and providing
the information on the EtherCAT bus.
Safety ratings for pressure-sensitive mat applications
Highest safety integrity level to EN 62061:2010
SIL3
Highest safety integrity level to IEC 61508:2010
SIL3
Category and highest performance level to EN ISO 13849-
1:2015
Cat. 3/PL e
Hardware fault tolerance (HFT) of two-channel application
(IEC 61508:2010/EN)
1
(a fault of the application need not cause the safeguard
to fail)
NOTE
Lay the feed lines of pressure-sensitive mats and bumpers together
In order to avoid influences and malfunctions due to EMC effects, lay the four
wires (e.g. SI0, SI0 TP, SI1, SI1 TP) together.
