Hi,
I have a Siemens Comfort panel HMI with datalog setup at a remote site and I have been given CSV data from a client for analysis of the log. Using TIA Portal V15.
I suspect I am seeing a spike on an analogue input to the system, possibly for a single scan (S7-1500 system). I am logging this process tag through the HMI in a datalog "on change", no deadband.
I am not seeing a spike in the value within the log however (CSV data) but by process of elimination within PLC logic, its the only thing I can think of which is causing the irregular system behaviour.
I think I am grasping at straws to get some sort of explanation and I am pretty sure I am wrong, but my question is this:
If a process tag is configured for logging "On Change" (no dead band) would this ALWAYS be logged by the HMI even if the process value has spiked for say a single scan only, or can it potentially be missed? If my theory is correct the spike value is around 20% higher than the nominal value being monitored by this input.
I have a Siemens Comfort panel HMI with datalog setup at a remote site and I have been given CSV data from a client for analysis of the log. Using TIA Portal V15.
I suspect I am seeing a spike on an analogue input to the system, possibly for a single scan (S7-1500 system). I am logging this process tag through the HMI in a datalog "on change", no deadband.
I am not seeing a spike in the value within the log however (CSV data) but by process of elimination within PLC logic, its the only thing I can think of which is causing the irregular system behaviour.
I think I am grasping at straws to get some sort of explanation and I am pretty sure I am wrong, but my question is this:
If a process tag is configured for logging "On Change" (no dead band) would this ALWAYS be logged by the HMI even if the process value has spiked for say a single scan only, or can it potentially be missed? If my theory is correct the spike value is around 20% higher than the nominal value being monitored by this input.