Cleco mPro300GCD-STO Serie Descripción Del Hardware página 20

1
EN
The time from the shutdown of an STO signal to the activity in the final stage of the controller is determined by the exter-
nal circuitry (see chapter 8.4 Control Signals, page 18), including controllers connected in parallel. The values given here
refer to the Passive circuit (see Fig. 1-4, page 20) with a controller and the maximum cable length. The time response is
different for each layout and must be checked at startup to see if it meets the minimum requirements.
8.7 Installation
When installing and wiring the signals, the requirements of EN 60204-1 must be met. In this case, particular attention
must be paid to measures for short circuit fault exclusion. For the STO cables 961924-xxx, the STO signals are individu-
ally protected by a ground connection. The connection to the first controller, and from controller to controller, must not be
longer than 60 m; in total in the system, a total length of up to 200 m is permitted for all of the STO connections.
The following circuit examples show the intended wiring of the STO interfaces. An analogous other use or connection is
not permitted.
Passive circuit X41
Fig. 1-4
The STO safety function can be requested by various devices. The switch S1 can be, for example, an emergency switch-
off device, a safety door switch, a light curtain or a safety relay. The safety requirement is 2-channel via the switch S1
and leads to the 2-channel shutdown of the final stage - therefore, this structure is for Category 3. The auxiliary power
supply 24 V for signal generation is provided on the interface.
Active circuit X41
Fig. 1-5
The STO safety function can also be requested through active, fail-safe outputs of a PLC or with contacts as in see Fig.
1-4, page 20, but with an external power supply. For an external power supply, only PELV power circuits and PELV
power sources may be used. The voltage source must provide a nominal voltage of 24 VDC (an absolute minimum out-
put voltage of 22 VDC) with at least 0.5 A.
20 P2552HW | REV D l 2023-12 Apex Tool Group