3.2.2
Operating principle on Flexi Classic
Flexi Loop MSTR1 or MSTR2 accessory
The safe sensor cascade is connected to the Flexi Classic safety controller with a Flexi
Loop MSTR1 or MSTR2 accessory. The Flexi Loop accessory enables the safe sensor
cascade to function as a dual-channel equivalent opening safety switch. The safety
information from the connected switches and sensors is collated and sent quickly and
securely to the inputs of the Flexi Classic safety controller.
In the example Flexi Loop is connected to the input control circuit A. Program 1 is
selected.
Figure 7: MSTR1 Flexi Loop accessor on the Flexi Classic safety controller
1
Program in Flexi Classic
2
MSTR1 Flexi Loop accessory
3
Safety sensors with monitored semiconductor output (OSSD)
4
Electro-mechanical safety switches
If a safety sensor or a safety switch at a Flexi Loop node switches to the OFF state, the
Flexi Loop MSTR1 or MSTR2 accessory can be relied upon to forward this cut-off infor‐
mation.
In the example, program 1 is cutting off the Q1 and Q2 OSSDs of the safety controller.
You can find detailed information about the safety controller programs in the “Flexi
Classic Modular Safety Controller” operating instructions (SICK part no. 8011737).
I/O functions of the Flexi Loop MSTR2 accessory
The Flexi Loop MSTR2 accessory supports non-safe I/O functions in addition to the
functions of the Flexi Loop MSTR1 accessory.
PRODUCT DESCRIPTION
3
8015836/YT10/2016-05-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Loop
17
Subject to change without notice
