Siemens Simatic M7-400 Manual do Utilizador descarregar pdf (Página 159)

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101

Digital Modules

4-37

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Ensuring a Wire Break Check Is Carried Out

To ensure that a wire break check is carried out, you require an external sensor

circuit using a resistor of 10 to 18 k The resistor should be connected parallel to

the contact and should be arranged as closely as possible to the sensor.

This additional resistor is not required in the following cases:

• If two-wire BEROs are used

• If you don’t parameterize the “Wire Break” diagnosis

Setting the Input Delay for Channel Groups

You can only set the input delay for each group of channels. In other words, the

setting for channel 0 applies to inputs 0 to 7 and the setting for channel 8 applies to

inputs 8 to 15.

Note

The parameters that are entered for the remaining channels (1 to 7 and 9 to 15)

must be equal to the value 0 or 8, otherwise those channels will be reported as

being incorrectly parameterized.

Any hardware interrupts that have occurred in the meantime will be reported after

acknowledgement.

Optimum Signal Propagation Delay

You can achieve the fastest signal propagation delay with the following settings:

• Both channel groups are parameterized with an input delay of 0.1 ms

• All the diagnoses (load voltage error, wire break) are deactivated

• Diagnostic interrupt is not enabled

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 637 638

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