Description of the hardware
5.3 Connecting/wiring
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
73
WARNING
Hazardous Voltage.
Can Cause Death, Serious Injury, or Property Damage.
If a two-channel evaluation is carried out via a module comprising two single-channel
function elements, the input signals must each be read by a linear and non-linear sensor
input.
If these specifications are not observed, the requirements of the highest protection class
are not fulfilled.
Note
When safe outputs or inputs are used on a single channel, a cable cross-circuit or the
reaction of loads can result in a dangerous malfunction. When stringent requirements
regarding safety must be fulfilled, the risk of dangerous malfunctions must be minimized by
implementing appropriate measures (e.g. protected cable installation).
To ensure reliable cross-circuit detection, note the following points when wiring the individual
modules:
1. All components (i.e. all modules including the sensors) must be operated on the same
power supply.
2. Cross-circuit detection is not possible with single-channel sensors.
3. A two-channel sensor must only be connected to a single (expansion) module.
4. A two-channel sensor must be connected to test outputs T1 / T2 to ensure cross-circuit
detection.
If a cross-circuit is detected, this applies to the entire module.
5. Test output T1 must always be combined with an odd-numbered sensor input (IN1, IN3,
IN5, IN7).
6. Test output T2 must always be combined with an even-numbered sensor input (IN2, IN4,
IN6, IN8).
7. Non-floating sensors must not be connected to test outputs T1 / T2.
8. Cross-circuit detection is not possible with non-floating sensors. In this case, cross-circuit
detection must be deactivated in the MSS ES tool. See also
Fixed-value parameters
(Page
160).
9. Outputs Q1 to Q8 can be combined as required.
10. Cross-circuit detection between three, four, or more inputs on one sensor is not possible.
For this reason, the cables for the two buttons must be routed separately to prevent a
cross-circuit (in two-hand operation, for example).
11. If a safety shutdown mat (cross-circuit principle) is connected to a module, cross-circuit
detection must be deactivated for the remaining inputs on this module because otherwise
the monitoring functions configured for these inputs will also signal a cross-circuit when
somebody steps on the safety shutdown mat.
For examples of how to wire sensors, see section
Wiring the MSS (Page 31).
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