4 FDM - Frequency Deviation Monitoring
4.1.5 Error-Bits
The FDM module registers errors and overflows and sets or deletes eight error bits then. In this way, the user
can find out if an "Overflow" occurs for example. These error bits document various error causes that occurred
during operation.
The displayed value has the format:
X8 X7 X6 X5 X4 X3 X2 X1
X8:
A2 Overflow, analog output 2 has reached its final value
X7:
A1 Overflow, analog output 1 has reached its final value
X6:
Time Deviation Overflow, the time difference is greater than +- 99.999s
X5:
Frequency Overflow, the frequency deviation is greater than the configured max./min values
X4:
REF Free, no sec-impulse from the reference
X3:
Power Line Time Free, no power line frequency (power line time remains at the last value)
X2:
No Time String, no serial time telegram received
X1:
No Power Line Time Init, the power line time has not (yet) been initialized
The error bits can be read out serially on request by an "E" (ASCII code 45h) via the interfaces COM 0/1.
The format of the response string is:
ERROR:X8X7X6X5X4X3X2X1<CR><LF>
IMS-FDM Setup Guide
Date: 4th November 2020
23
