Accelnet Plus Micro Modules User Guide
16-01687 Rev 03
Copley Controls
Page 104 of 139
STO:
I
NSTALLATION FOR
AEV
&
APV
M
ODULES
Energizing STO Inputs
This diagram shows the two STO channels that are the essential channels to prevent current
flow in the motor when the STO function is activated. These inputs can be driven by either
current sourcing or sinking devices.
STO Inputs from 24V Control Signals
Part
PartNum
Qty
Mfgr
Diode, zener, 6.2V, 200mW DDZ6V2BS-7
2
Diodes Inc
Diode, zener, 5.1V, 500mW DDZ5V1BSF-7
2
Diodes Inc
Resistor, 6.19 k, 0.4 W, 1% ESR10EZPF6191
4
Rohm Semiconductor
Resistor, 2.2 k, 2 W, 1%
RHC2512FT2K20
2
Stackpole Electronics
Note: The 12.4k resistors in the graphic represent the 6.19k resistors in the table.
STO Power Requirements
The +24 Vdc power supply for the STO inputs must be SELV or PELV rated.
(refer to
STO Wiring Requirements
Electrical connections to the STO inputs must meet the requirements for fault exclusions for
short circuits between conductors and short circuits between conductors and other conductive
parts or earth or the protective bonding conductor. These requirements are given in ISO
13849-2 and IEC 61800-5-2.
When driven from a single +24 Vdc power supply, the STO inputs must be connected in
parallel as shown above. Driving the STO inputs in series would require a higher voltage than
the n24 Vdc, and if one of the STO inputs or its wiring were to fail as a short-circuit,
it would apply the full DC power to a single input.
unctional Safety Circuit oundary