Object Function Blocks; Output Objects; Ossd (Safety Outputs) - Reer MZERO Installation, Use And Maintenance Manual

OBJECT FUNCTION BLOCKS

OUTPUT OBJECTS

OSSD (safety outputs)

OSSD safety outputs use semiconductor technology, if
the input "In" is at logic level 1 (TRUE) then the "Out1"
and "Out2" will be set at 24 VDC (module power supply).
If the input "In" is at logic level 0 (FALSE) then the "Out1"
and "Out2" will be set at 0 VDC.
➔
Each pair of OSSD outputs has a relative
RESTART_FBK input.
Parameters
Manual Reset: If selected this enables the request to reset each time the input signal falls. Otherwise, output
Follows directly In input Signal level.
External K time monitoring: If selected, enables the setting of the time window within which the external
feedback signal is to be monitored (according to following output conditions).
OUTPUT
With high level (TRUE) OUTPUT, the FBK signal must be at low level (FALSE) within the set time. Otherwise,
OUTPUT is set to low level (FALSE) and the error is indicated on the MZERO by the flashing OSSD LED
corresponding to the OSSD in error.
Reset position: allows to select the physical terminal of MZERO to give the reset command.
You can also use the same terminal for different OSSD outputs.
8541403 • 19/07/2021 • Rev.1
STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
FBK
1 0
0 1
There are two types of reset: Manual and
Monitored. In selecting the Manual option
only signal transition from 0 to 1 is verified.
If the Monitored option is selected, the
double transition from 0 to 1 and back to 0
is verified.
Enable Status: If selected, enables the
connection of the current OSSD state to
any point on the schematic.
MZERO OSSD LED
ERROR
0
1
0
Flashing
41