26 Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Chapter 3 Power, Ground, and Wire
Electromechanical Outputs
Internally, the CI, DI, EM, EMD, and SI safety relays have two positive-guided
relays that are connected in series to form the safety outputs. One side of the
contact must be connected to a voltage supply (see Specifications
on page 89
for appropriate ratings). The other side of the contact must be connected to a
load.
Figure 15 - Electromechanical Output Connections
OSSD Outputs
The DIS safety relay has OSSD safety outputs on terminals 14, 24, 34 and 44.
Output terminals 14 and 24 are pulse tested and can switch loads up to 1.5 A.
They can only tolerate a load capacitance up to 1.6 µF. Terminals 34 and 44
have a series diode and can switch loads up to 0.5 A. They can tolerate a load
capacitance up to 9 µF. Terminals 34 and 44 are also pulse tested, but these
pulse tests are ignored as they are not used for short-circuit detection. These
terminals are intended for devices with high capacitance. For example, use
terminals 34 and 44 when connecting to the Enable input of the PowerFlex® 70
drive and the Safe Torque Off inputs of the PowerFlex and Kinetix® drives.
The pulse-tested outputs check for short circuits between the following:
•Each terminal.
• Each terminal and the 24V supply.
• Each terminal and 24V common. The load must be connected to the
same voltage reference as terminal A2.
The load must be connected to the same voltage reference as terminal A2. All
four OSSD outputs are short-circuit protected.
Figure 16 - OSSD Output Connections
13 23 33 43
14 24 34 44
K4K3
K2K1
V supply
V common
EM
17 27 37 47
18 28 38 48
K4K3
K2K1
V supply
V common
EMD
13 23 33
14 24 34
K3
K2K1
V supply
V common
SI
13 23
14 24
K2K1
V supply
V common
CI
13 23
14 24
K2K1
V supply
V common
DI
34 44 14 24
A1
A2
K4K3
K2K1
24V DC supply
24V common
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