Siemens SIMATIC NET Spezifikationen PDF herunterladen (Seite 244)

234 Siemens Simatic S7 Driver Online Help

I have a high timeout count

You can perform several steps to determine what is causing a high timeout count in

the driver’s statistics.

[1] Examine your cable. You may have a bad connection.

[2] Try increasing the value for the Reply Timeout or the Global Timeout

property.

[3] Verify that the communication processor, virtual field device, and connection

name match those defined in your SIMATIC NET configuration.

[4] Examine your network interface cards. Make sure they are working correctly.

[5] Examine the load on your process hardware. If the load is high, decrease the

PLC scan time and increase the values for the reply timeout and the SAPI

timeout.

Why am I receiving the error Invalid Address when I create a

block in Database Manager?

If you are receiving the error ‘Invalid Address’ when you create a database block that

references a datablock in the Power Tool, verify that the address exists and is defined

in your driver configuration.

If the address is valid, examine the data type of the datablock you are accessing. If it

is a multi-byte data type, such as an integer, a word, or a real, you can access the data

on two-byte or four-byte boundary, depending on your data type. For example, if you

define a datablock with a starting address of M0 and length of 100, you can access

this memory using the following address when the data type is INT:

M0, M2, M4, M6, etc.

Notice that these addresses occur on two-byte boundaries because INT requires two

bytes. Accessing M1 is invalid because you are requesting the high byte from one

word and the low byte from another.

Likewise, when the data type is REAL, you can access the data with these addresses:

M0, M4, M8, M12, M16, etc.

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Siemens SIMATIC NET Spezifikationen Seite 244