Connecting Signal Lines - Leuze electronic MSI 200 Series User Manual

Observe manufacturer's 
specifications
Ensure signal 
redundancy
Cable lengths
MSI 100 and MSI 200
Leuze electronic
7.4.1

Connecting signal lines

Connect the sensors and actuators according to your safety requirements and the respective
manufacturer specifications.
Ensure signal redundancy when connecting the signal lines of two-channel command devices
and sensors to the inputs of the safety modules.
WARNING: Loss of the safety function through cross circuits and short circuits
Cross circuits and short circuits can lead to the loss of the safety function.
Prevent cross circuits and short circuits by using a suitable cable installation.
•
Implement cross-circuit detection.
•
You can find further information on the topics of signal redundancy through dual signals, two-
channel sensors and cross-circuit detection in the help system of the MSIsafesoft configura-
tion software.
Many applications use large numbers of sensors or command devices. Depending on the size
of the machine or system, a considerable amount of cabling may be required to wire the sen-
sors.
WARNING: Loss of the safety function through interference
To avoid interference, always cover both cable ends at the inputs as well as the outputs.
ATTENTION: Reduced availability through excessively long cables
If the maximum permissible cable lengths are exceeded, the safety modules automatically
trigger the safety function, even if it was not requested. Your system thereby suffers an
unwanted reduction in availability.
Do not exceed the maximum permissible cable lengths.
•
See "Maximum cable lengths" for the safe inputs of the MSI 100/200 modules on pages 101
and 101.
Connecting signal lines for the safety modules:
1. Connect the sensors to safe inputs I0 to I19.
2. Connect the actuators to safe outputs O0 to O3.
3. Optional: Also connect the actuators to ground-switching outputs O0- (assigned to O0)
and O1- (assigned to O1) to increase the shutdown protection and cross-circuit protection.
4. Optional: Implement a signaling function by, e.g., connecting a non-safe PLC or a signal
unit to signal outputs M0 to M3.
5. Optional: Implement cross-circuit detection for the "even" inputs I0, I2, I4, ... I18 by wiring
these to clock output T0. 
For the "odd" inputs I1, I3, I5, ... I19, use clock output T1.
Mounting, removal and electrical installation
MSI 100/200 67