ABB FSPS-21, User Manual

Page: 24 / 214

• Safe torque off (STO) :This safety function activates the STO function in the drive, this
is, opens the drive STO circuit. The motor coasts to a stop (stop category 0).
• Safe stop 1 (SS1-t) : This safety function stops the motor safely by ramping down the
motor speed to zero speed (stop category 1). When the drive indicates that zero speed
is reached, this safety function activates the drive STO. If zero speed has not been
reached within the SS1-t monitored time limit, this safety function activates the drive
STO.
The module is installed into an option slot on the drive control unit. See the drive manuals
for module placement options.
￭ Diagnostics
The FSPS-21 module performs extensive auto diagnostics tests during the power-up and
runtime operation on internal parts as well as the communication and STO connection
between the module and the drive.
Fault reaction function
The module activates STO and goes into Fail-safe mode if it detects a fault in:
• the STO connection between the FSPS-21 module and the drive STO connector.
• the internal parts of the module (CPU, memory, etc).
The module activates STO and goes into the Passivation state if it detects a fault in:
• the PROFIsafe communication between the module and the safety PLC.
The fault reaction function activates the fail-safe mode as described in chapter FSPS-21
module modes and states (page 117) .
￭ Automatic acknowledgement
FSPS-21 only has an automatic acknowledgement method for a safety function. This means
that when the safety function request is removed, the FSPS-21 automatically enters the
Operational state. Automatic acknowledgement also takes place during module start-up.
Manual acknowledgement can only be programmed into a safety PLC. For more information
on FSPS-21 states, see section
States (page 30) .
WARNING!
FSPS-21 module has automatic acknowledgement method. Make sure that the
system is designed so that this does not cause unacceptable risk, eg, due to
automatic start of the drive.
Ethernet network
Ethernet standards support a variety of physical media (coaxial cable, twisted pair, fiber
optics) and topologies (bus and star).
The FSPS-21 module supports twisted pair as the physical media. FSPS-21 supports star
topology, daisy chain topology and ring topology
The maximum length for an Ethernet segment on twisted pair media is 100 meters. All
twisted pair media between the Ethernet node and the switch or router must be shorter than
100 meters, including media within patch panels.
￭ Example topology of the Ethernet link
The figures below show example topologies for an Ethernet network with FSPS-21.
24 Overview of the FSPS-21 module and the Ethernet network