Advantech Automation1 XC4, Hardware Manual

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Table 2-27: STO Electrical Specifications
Status Value
STO off (motion allowed) 18-24 V, 7 ma
STO on (safe state entered, no motion) 0-6 V
Recommended Wire Gauge
22-26 AWG (0.5 - 0.14 mm
2
)
STO System Power Supply PELV
STO Wire Length (maximum) 50 m
Figure 2-32 shows one safety device connected to multiple XC4s in parallel.
WARNING : The XC4 does not check for short circuits on the external STO wiring. If this is
not done by the external safety device, short circuits on the wiring must be excluded. Refer
to EN ISO 13849-2. For Category 4 systems, the exclusion of short circuits is mandatory.
Figure 2-32: Typical Configuration
XC4 Hardware Manual 2.4. Safe Torque Off Input (STO)
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