58 Safety functions
Limit hit: If the motor speed hits a ramp monitoring limit, the FSO module activates
the STO function and generates an event. The user can select the event type
(warning, fault or event) with parameter FSOGEN.62 STO indication safety limit.
Safety function indications
Safety functions have the following indications:
• Request indication, which is shown in the control panel or in the event log (stopping
functions (STO, SS1, SSE) and POUS)
• Digital output indication, see Parameters on page 401
• Status bit indication, see FSO PROFIsafe profiles on page 201 and Status and
control words on page 449.
Request indication
The safety function request indication for stopping functions (STO, SS1, SSE) and
POUS is activated immediately when a safety function is requested. The type of the
indication (event type) is selected with parameter FSOGEN.61 STO indication ext
request.
Note: For the POUS function, the request indication is always a warning if activated
when the drive is not modulating, and the indication is a fault, when the drive is
modulating, see FSO premature POUS on page 492.
FSO digital output indication
FSO digital outputs can be configured for indication or for controlling, eg, safety door
locking/unlocking. Digital output indications for the safety functions are explained in
connection with the safety function descriptions in chapter Safety functions, in
Configuring I/O on page 319, and in Parameters for FSO inputs and outputs on page
441.
If configured to a function output parameter, the digital output is controlled to change
state immediately when a safety function is requested. If configured to a function
completed output parameter, the digital output is controlled to change state when a
safety function is completed.
Note: A logic state of output indication signals can be configured to be active low or
active high.
See also chapter PROFIsafe for Remote I/O control on page 199.
E Scaling speed: value of parameter 200.202 SAR speed scaling. Speed value that the
FSO module uses as a reference point in ramp time calculations. This value and the
minimum (A), target (B) and maximum (C) ramp times define fixed slopes for the
deceleration ramps that are used in ramp monitoring.
Common for all ramps SARn, n = 0…1.
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