Intfbk_In / Intfbk_Out (Max Number = 8) - Reer MZERO Installation, Use And Maintenance Manual

INTFBK_IN / INTFBK_OUT (max number = 8)

This operator can be used to create logical loops or to connect the output of a function block to
the input of another function block. IntFbk consist of IntFbk_In and IntFbk_Out; after one MZERO
logical cycle delay, every IntFbk_In assumes the same logical value of the corresponding
IntFbk_Out.
INTFBK_IN
(scheme
side SX)
The element "IntFbk_Out" must have a number which, invoked by the corresponding
"IntFbk_In", allows the desired link.
Figure 45 – INTFBK_IN / INTFBK_OUT operator scheme example

If not carefully designed feedback loops could trigger dangerous system oscillations and as a
consequence makes the system unstable. An unstable system may have severe consequence
to the user like severe injuries or death.
8541403 • 19/07/2021 • Rev.1
STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
INTFBK_OUT
(scheme
side DX)
107