Siemens HS Specifikace stáhnout pdf (Strana 32)

Interrupts/diagnostics alarms

5.3 Diagnostics alarms

Analog Input Module AI 8xU/I HS (6ES7531-7NF10-0AB0)

Manual, 07/2014, A5E03484886-AC

5.3

Diagnostics alarms

A diagnostics alarm is output for each diagnostics event and the ERROR LED flashes on the

module. The diagnostics alarms can, for example, be read from the diagnostics buffer of the

CPU. You can evaluate the error codes with the user program.

If the module is operated distributed with PROFIBUS DP in an ET 200MP system, you have

the option to read out diagnostics data with the instruction RDREC or RD_REC using data

record 0 and 1. The structure of the data records is available on the Internet in the "Manual

for interface module IM 155-5 DP ST (6ES7155-5BA00-0AB0)".

Table 5- 5 Diagnostics alarms, their meaning and corrective measures

Diagnostics alarm

Error code

Meaning

Remedy

Wire break 6

Impedance of sensor circuit too high Use a different encoder type or modify

the wiring, for example, using cables

with larger cross-section

Wire break between the module and

sensor

Connect the cable

Channel not connected (open)

• Disable diagnostics

• Connect the channel

Overflow

Measuring range violated

Check the measuring range

Underflow

Measuring range violated

Check the measuring range

Load voltage missing 11

Supply voltage L+ of the module is

missing

Connect supply voltage L+ to mod-

ule/channel

Diagnostics alarms with value status (QI)

If you configure the module with value status (QI), the module always checks all errors even

if the respective diagnostics is not enabled. But the module cancels the inspection as soon

as it detects the first error, regardless if the respective diagnostics has been enabled or not.

The result may be that enabled diagnostics may not be displayed.

Example:

You have enabled the diagnostics "Underflow", but the module detects the

previous diagnostics "Wire break" and cancels after this error message. The "Underflow"

diagnostics is not detected.

Recommendation:

To ensure that all errors get diagnosed, select all check boxes under

"Diagnostics".

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