Cascade - ABB FSO-21 User Manual

At power-up, the FSO goes into the Start-up mode; it performs start-up checks and,
according to the configuration, enters the Operational state either automatically or
after an acknowledgement request from the FSO I/O or from a safety PLC.
The Drive composer pro PC tool can request the Configuration mode, when the FSO
is in the Start-up, Operational, Safe or Fail-safe mode and the drive is in the Torque
off mode (not modulating). The FSO exits the Configuration mode into the Start-up
mode when the user either:
• downloads the new configuration to the FSO,
• switches the power off and on (through the Power down state),
• reboots the FSO with the Boot FSO button in the Drive composer pro PC tool, or
• reboots the FSO with drive parameter 96.09 FSO reboot (see the drive firmware
manual).
If there is an internal fault, the FSO enters the Fail-safe mode. The FSO exits the Fail-
safe mode into the Start-up mode when the user either:
• switches the power off and on (through the Power down state),
• reboots the FSO with the Boot FSO button in the Drive composer pro PC tool, or
• reboots the FSO with drive parameter 96.09 FSO reboot (see the drive firmware
manual).
When the FSO is in the Power down, Start-up, Configuration, Safe or Fail-safe mode,
the drive STO function is always active. When the FSO is in the Operational state, the
drive STO function is inactive (except when the POUS function is active, the drive
STO function is also active).
Note: When the drive is connected to a safety PLC via the PROFIsafe over
PROFINET communication bus, see the states diagrams in section
modes and states


Cascade

It is possible to cascade up to six FSO modules into a daisy-chain type network
(resembles somewhat an I/O master/follower system): If an FSO triggers a cascaded
safety function, it passes the triggering information to the next FSO, which triggers
the next one, and so on, until the last FSO again triggers the first one.
Without a PROFIsafe communication bus, you can cascade only safety functions
which have a primary and a secondary digital input: STO, SS1, SSE, SLS1, SDI
positive and SDI negative.
For detailed configuration instructions, see section
system on page 257.
on page 177 in chapter PROFIsafe.
Safety functions 55
FSO module
How to configure a cascaded