Leuze electronic MSI 400 Series Manual page 78

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The MSI 400 system does not permit direct influencing of the security-oriented output terminals. Instead, up

to 400 databits can be specified. In this way, it is possible to use the input data blocks 1 to 5 in MSI.de-

signer for bit-wise access. The simplest way to control output terminals with a PLC is by connecting the ap-

propriate gateway bit to an output in the logic editor of MSI.designer. The following figure shows an ex-

ample:

Fig. 8.5:

Direct connection of a gateway input bit to an output terminal of the MSI 430 module

Check your application thoroughly for correctness!

Because the MSI.designer only checks for logic-internal connection errors, you have to check

the following aspects systematically yourself:

Ä Does your application agree with the results from the risk analysis and the avoidance

strategy?

Ä Have all of the applicable standards and guidelines been complied with?

If not, you are placing the machine's operator in danger.

Note that the output terminal is set to Off as standard and thus stands for the value "0". This value is al-

ways used when the controller module is not in Run mode or it the output is not configured via the logic ed-

itor in MSI.designer.

The standard value of gateway output bits can be configured using attributes 5 and 6.

If there is a loss of connection between the PLC and the controller module, instance attribute 5 controls

whether the gateway data bit is set or not. The specified value is controlled by instance attribute 6.

A write request to attribute 3 of instances 1 to 400 is refused if the Assembly instance 37 [chapter 8.5.2.1]