Connecting
4.3 STO via Power Module terminals
Power Module PM240P-2
Hardware Installation Manual, 06/2020, A5E37800827C AD
45
4.3 STO via Power Module terminals
Description
The "Safe Torque Off" (STO) safety function can be implemented via terminals on the power
modules of frame sizes FSD … FSF.
Figure 4-6 Terminals and switches for the "STO via power module terminals" function
The two switches have the following function:
● Both switches = ON: STO is enabled
● Both switches = OFF: STO is locked
● Two switches different: not permissible
Terminals STO_A and STO_B are low active.
Connect line to select STO
Use a SELV or PELV power supply with 24 V DC (20.4 V … 28.8 V, maximum 60 V briefly)
for the STO_A and STO_B connections.
Use a shielded cable with the following properties:
● Length ≤30 m
● Cross section 0.5 mm
2
… + 1.5 mm
2
(20 … 16 AWG)
● Insulated for 600 V
Use conductor end sleeves, stripped length 7 mm.
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