Cleco mPro300GCD-STO Serie Descripción Del Hardware página 18

1
EN
Pin
1
2
3
4
5
6
7
8
Interface port X42 – OUT
Depending on whether the currently considered controller is the last in an STO line, or whether another controller follows,
the interface X42 is the connection to the next controller or can be left without connecting further. If the feedback contact
is evaluated, a termination on the last controller in a line is necessary.
Pin
1
2
3
4
5
6
7
8
8.4 Control Signals
With the two control inputs STO-A and STO-B, the STO safety function is requested by two channels. They allow the
direct connection of safe semiconductor outputs (electronic safety relays, active safety sensors) and of switching con-
tacts (safety relays with relay outputs, passive safety sensors, such as positively driven position switches), see chapter
8.7 Installation, page 20.
To request the STO safety function, the 24 V control voltage at both control inputs STO-A and STO-B is switched off
(0 V). If both control signals are switched off simultaneously or within a specified discrepancy time, then the STO safety
function is active.
Tolerance ranges are defined for the input voltage range of the control inputs STO-A and STO-B. The amount of energy
stored in the components of the STO circuit (e.g., capacitors) depends on the magnitude of the input voltage. During
switching operations, these amounts of energy must be charged or discharged. As a result, the dependent values for the
switch-off time for the transition to the safe state (STO) come about from the input voltage, see chapter 9.3 Electrical
Data, page 22.
For the time response itself see chapter 8.6 Time response, page 19.
Discrepancy time
The transition between a safe and an unsafe state is initiated by level changes at the control inputs STO-A and STO-B.
According to the specifications for the safety function, both levels must be identical; otherwise an error message will be
generated. A state machine in the controller monitors both signals over time. Due to component tolerances or bouncing
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Signal Description
24 VDC Output auxiliary power supply 24 VDC, for passive control of STO. Refer-
ence potential is GND_STO.
24 VDC
FB-1-IN Potential-free Feedback Contact 1 (informative) for the STO state
• Feedback contact open: STO not active
• Feedback contact closed: STO active
STO-A Input for control signal A for controlling the STO safety function. Reference
potential is GND_STO
• STO request at low level simultaneously with low level at STO-B
GND_STO Reference potential for all voltages at X41.
STO-B Input for control signal B for controlling the STO safety function. Reference
potential is GND_STO
STO request at low level simultaneously with low level at STO-A
•
FB-2 Potential-free Feedback Contact 2; for a description see FB-1.
GND_STO Reference potential for all voltages at X41.
Signal Description
n. c. –
n. c. –
FB-1-OUT Potential-free Feedback Contact 1
STO-A Output for control signal A for controlling the STO safety function of the
next controller, bridged with X41.4.
GND_STO Reference potential for all voltages at X42.
STO-B Output for control signal B for controlling the STO safety function of the
next controller, bridged with X41.6.
Potential-free Feedback Contact 2, bridged with X41.7.
FB-2
GND_STO Reference potential for all voltages at X42.
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