Characteristics Of S7 Communication - Siemens SIMATIC NET 6GK7 443-5FX02-0XE0 Manual

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Table of Contents

Performance Data

Cycle Load Caused by FMS Connections

When calculating the reaction times with FMS connections, the run time of the

function blocks (FBs) in the S7-400 CPU (416-1 see Table 5-4) is the decisive

factor.

The table below shows the cycle load resulting from the available FCs in ms. A

distinction is made between the statuses "job completed" and "job active".

Table 5-4

Status

Component / FB

READ

WRITE

STATUS

REPORT

IDENTIFY

Note

To allow module replacement without a PG, settings on the CPU must be

modified. Open the Properties dialog of the CPU in HW Config; in the "Monitoring

time for" box in the "Startup" tab, check and, if necessary, modify the following

values:

- "Transfer of parameters to modules" (recommended value = 600 *100 ms)

Depending on your system (station configuration), you may need to increase the

following parameter:

- "Ready message from modules"

For more detailed information about supported services and parameters, refer to

the PICS tables (PICS: Protocol Implementation Conformance Statements) in the

manual /4/.

5.4