2.4.11.2 Use as directed
The safety function STO is exclusively intended to provide functional safety, by preventing
the restart of a system.
To achieve this functional safety, the wiring of the safety circuits must meet the safety
requirements of IEC 60204, ISO 12100, IEC 62061 and ISO 13849-1.
If STO is automatically activated by a control system, then make sure that the output of
the control is monitored for possible malfunction.
To achieve SIL3/PLe with dual channel operation, the safe switching of the pulse inhibitor
must be tested periodically by analyzing the feedback signal by the safety control.
2.4.11.3 Prohibited Use
The STO function must not be used if the drive is to be made inactive because of:
Cleaning, maintenance and repair operations, long inoperative periods:
In such cases, the entire system should be disconnected from the supply by the per-
sonnel, and secured (main switch).
Emergency-Off situations: the mains contactor must be switched off).
2.4.11.4 Technical data STO
Safety characteristic data
Unit Operation
Mode
EN
13849-1
EN
62061
S701...S724:
PFHD [1/h]
S748...S772:
PFHD [1/h]
TM
[Years]
STO1/2 Enable single channel PLd,
Cat.3
SIL CL
2
7.05E-08 7.05E-08 20
STO1-Enable+
STO2-Enable
dual channel PLd,
Cat.3
SIL CL
2
7.05E-08 7.05E-08 20
STO1-Enable+
STO2-Enable+
STO-Status
dual channel +
periodical
testing
PLe,
Cat.4
SIL CL
3
1.04E-09 1.38E-09 20
The test sequence desription can be found in the Instructions Manual.
Technical data
STO1-Enable and STO2-Enable Data
Input voltage 20V..30V
Input current 33mA – 40mA (Ieff)
Peak current 100mA (Is)
Response time (falling edge at STO input
until energy supply to motor is interrupted)
STO1: 1ms
STO2: 2ms
S700 Safety Guide | 2 English
Kollmorgen | wiki-kollmorgen.eu | February 2017 59
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