Parker 638 series

2 Connection Assignments and Functions
Connection Assignments and FunctionsConnection Assignments and Functions
Connection Assignments and Functions
07-02-12-02-EN-V1215.doc / Type: 638
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2.6 Safe Torque Off
● Connection Safe Torque Off X11
Plug - X11
PIN
Description Function
1 STO1 # Channel 1 (ACTIVE_STO1)
2 STO1 # Channel 1 (ACTIVE_STO1) Parallel to PIN 1
3 0V / PE Reference Potential 0V
4 STO2 # Channel 2 (ACTIVE_STO2)
5 - Ready potential-free contact assembly
6 - Ready potential-free contact assembly
Further description of this function can be found in Chapter “Safe Torque Off“ (STO)
● Connection WITHOUT the utilization of the Safe Torque Off, (STO), function
Input ACTIVE
PIN
Description
(24V) 1 STO1 #
2 STO1 #
0VSPS 3 0V / PE
4 STO2 #
5 -
6 -
The control supply voltage must be definitively separated, in accordance to
regulation EN 1578
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