Preconditions Of The Status Update; Influence Of The Operating State On The Target System; Communication And Cycle - Siemens SINUMERIK 828D Function Manual

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P4: PLC for SINUMERIK 828D

14.4 Test and diagnostic functions

Preconditions of the status update

Before you can update the status to monitor and test your program, you must execute the following tasks:

Your program must be able to be compiled error-free.

You must have set-up the communication between the Programming Tool PLC828 and the target system.

Your program must have been loaded error-free into the target system.

After you have loaded the program into the target system, then you should again bring this into the RUN

operating state. Otherwise, the address status is displayed, however, the target system cannot execute the

program so that you are not shown the logic operations that you expect.

The type of monitoring and test functions that you execute depends on the operating state of your target system.

Even if your program is not executed in the STOP operating state, the operating system of the target system still

monitors the target system (status of RAM and I/O, and transfers the data status to the Programming Tool

PLC828. If the target system is in the STOP operating state, then you can execute the following functions:

You can display the actual values of the addresses in the table status or in the program status. (This is the

same as the function "Single read", as the program is not executed.)

You can write values in the table status.

You can execute a certain number of cycles and display the effect in a status chart and/or in the program

If the target system is in the RUN operating state, you cannot execute the functions "First cycle" or "Several

cycles". You can write values into a status chart, you can also execute the following functions (not in the STOP

operating state):

In the table status, you can carry out the continuous updates. (If you wish to only execute an update, you must

switch-off the table status so that you can execute the command "Single read".)

You can execute continuous updates in the program status.

In a continuous cycle, the target system reads the inputs, it executes the program, writes to the outputs and

executes system functions as well as the communication. This cycle runs with an extremely high speed of many

times per second. Even if the Programming Tool PLC828 issues status requests in a fast sequence, it is

important that you clearly understand that you cannot monitor each individual event that takes place in the target

system. When using the program status or the table status, if you read data values from a target system program,

the interrogate the data by taking samples (spot check). The update rate of the status values read from the target

system depends on the communication baud rate.

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

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