5.8 Stop-, Emergency Stop-, Emergency Off Function to IEC 60204
With the functional safe, certified function STO (see page 41 onwards) the drive can be
secured on standstill (torque-free) using its internal electronics so that even when power
is being supplied, the drive shaft is protected against unintentional restart (up to SIL CL3
according to IEC 62061, PLe according to ISO 13849-1).
With built-in “Safety” expansion card, more safe drive functions in accordance with IEC
61508 are provided (see page 152 ff).
The parameters “STOPMODE” and “ACTFAULT” must be set to 1 in order to implement
the stop and emergency stop categories. If necessary, change the parameters via the ter-
minal screen of the setup software and store the data in the EEPROM.
Examples for implementation can be found in the Product WIKI on page "Stop and
Emergency Stop Function".
5.8.1 Stop
The Stop function is used to shut down the machine in normal operation. The Stop
functions are defined by IEC 60204.
Category 0: Shut-down by immediate switching-off of the energy supply to the
drive machinery (i.e. an uncontrolled shut-down); this can be done
with the built-in STO functionality (see page 41)
Category 1: A controlled shut-down , whereby the energy supply to the drive
machinery is maintained to perform the shut-down, and the energy
supply is only interrupted when the shut-down has been completed;
Category 2: A controlled shut-down, whereby the energy supply to the drive
machinery is maintained.
The Stop Category must be determined by a risk evaluation of the machine. In addition,
suitable means must be provided to guarantee a reliable shut-down.
Category 0 and Category 1 Stops must be operable independently of the operating mode,
whereby a Category 0 Stop must have priority. Stop functions must be implemented by
disconnection of the appropriate circuitry, and have priority over assigned start
functions.
If necessary, provision must be made for the connection of protective devices and
lock-outs. If applicable, the Stop function must signal its status to the control logic. A reset
of the Stop function must not create a hazardous situation.
Examples for implementation can be found in the Product WIKI on page "Stop and
Emergency Stop Function".
S701x2-S724x2 Instructions Manual 39
Kollmorgen 07/2014 Technical description
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