Siemens 6SE7027-2ED84-1HF3 MASTERDRIVES POWER CONTROLLER MODULE

Siemens 6SE7027-2ED84-1HF3

Siemens 6SE7027-2ED84-1HF3

Siemens 6SE7027-2ED84-1HF3

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1: How to avoid "communication failure" messages when using CPU 315F and ET 200S?

If you use CPU S7 315F, ET 200S, and the fail safe DI/DO module, you will call the fail safe program of OB35. Moreover, you have accepted the default settings for all monitoring times and are willing to receive "communication failure" messages. The default setting for OB 35 is 100 milliseconds. You have set the F monitoring time of the F I/O module to 100 milliseconds, so the I/O module needs to be addressed at least once every 100 milliseconds. However, due to the fact that OB 35 is only called once every 100 milliseconds, communication failures may occur. To ensure that there is a difference between the scanning interval of OB35 and the F monitoring time, please ensure that the F monitoring time is greater than the scanning interval of OB35.

This issue occurs in the S7 distributed security system, up to V5.2 SP1 and 6ES7138-4FA00-0AB0, 6 ES7138-4FB00-0AB0, and 6ES7138-4CF00-0AB0. In the new module, the F monitoring time is set to 150 milliseconds

2: What is the monitoring time of the S7-300 CPU on the PROFIBUS when the DP slave station is unavailable?

When using the DP slave on the PROFIBUS interface of the CPU to operate the PROFIBUS network, it is desired to check whether the expected configuration matches the actual configuration during startup. Two different times are given on the Startup tab in the CPU properties dialog box.

3: How to identify power or buffer errors, such as battery failure?

If an error in the power supply (S7-400 only) or buffer triggers an event, the CPU operating system accesses OB81. After correcting the error, revisit OB81. In case of battery failure, if BATT is detected during battery detection If the INDIC switch is activated, S7-400 only accesses OB81. If OB81 is not configured, the CPU will not enter the operational state STOP. If OB81 is not available, the CPU will still run when there is a power error.

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