Safety functions 59
Status bit indication
PROFIsafe status bit indication of the safety function is relevant when the FSO
module is part of a PROFIsafe control system. These are safety-related indications.
Note: Status and control words (see Status and control words on page 449) are not
safety-related indications, and they can be used for monitoring purposes only. They
are not allowed to be used as safe status and control indications in PROFIsafe/safety
systems.
STO, SS1, SSE, POUS functions
States of the configured and connected functions are indicated with FSO digital
outputs and fieldbus status signals when the function is started:
• Stopping functions (SSE and SS1) are always started and their active state
indicated immediately (the monitoring method depends on the configuration)
(parameters SSE.21 SSE output and SS1.21 SS1 output).
• The drive STO state is indicated when the drive STO circuit is open (parameter
STO.21 STO output and octet 0 bit 7 STO_active).
Note: When the SBC is activated before the drive STO, the drive STO active state
is indicated after a delay (parameter SBC.12 STO SBC delay).
Note: SBC active state is indicated only with status bit (octet 0 bit 6 SBC_active).
• POUS active state is indicated immediately when requested from an input
(POUS.21 POUS output).
• Ramp monitoring (SAR0 and SAR1, see section Configuring SAR on page 361) is
not indicated.
The FSO module switches off the digital output indications (SSE, SS1 and POUS
functions) when the function is acknowledged.
Stop completed indications are activated when the stopping function has completed,
but is not yet acknowledged. There are separate indications for each stopping
function STO, SSE and SS1 (parameters STO.22 STO completed output, SSE.22
SSE completed output, SS1.22 SS1 completed output) and one common for all of
them (parameter FSOGEN.11 Stop completed output). The FSO module switches off
the indications when the function is acknowledged.
The completed indication of the POUS function (parameter POUS.22 POUS
completed output) is activated after the time defined by parameter POUS.13 POUS
delay for completion has passed. The FSO module switches off the completed
indication when the POUS request is removed.
SLS, Variable SLS
• SLS active state is indicated when the motor speed is in the user-defined range.
The FSO module switches off the indication when the function is acknowledged or
the monitored speed exceeds the user-defined limit (this also causes the SLS to
trip, that is, the FSO module activates the SSE function).
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