Introduction to the manual 19
be installed to disconnect the drive from the power grid or from the motor in the
rare case of an internal STO failure. For further information, refer to Supplement
for functional safety (3ADW000452R).
• Safe speed estimate: It is not possible to use the safe speed estimate with a
DCS880 converter. Thus, the FSO-21 module cannot switch to safe speed
estimate in case of an encoder failure but activates the STO function instead.
• For the same reason, speed-dependent safety functions are not available without
a safety encoder (for details see section Safety encoders on page 43). It is
recommended to always use an FSE-31 module with a safety encoder together
with the FSO-21 module.
• Sections in this manual which describe the safe speed estimate or sections which
refer to drive modulating are not applicable to DCS880.
Controller stations
For example the following controller stations are supported. Check the compatibility
of the controller station in its manual.
• ABB AC500-S Safety PLC. For more information, see AC500-S Safety User
Manual (3ADR025091M0207 [English])
• Siemens SIMATIC Fail-safe S7 PLC
Tools
• Drive composer pro PC tool: version 1.8 or later
Note: This manual applies to the Drive composer pro PC tool versions until 1.12. If
you use a later version, the menus and button names can differ from the ones used in
this manual. For more information, see the documentation of the tool.
WARNING! ACS880 drives equipped with the label “No FSO support” are not
compatible with FSO-21. Do not use this combination.
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