Perspective Momentary Button
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Ali Etezadkhah
I would like to request this feature as well. I understand the pitfalls, but in certain situation we are not allowed to modify the PLC code and have to work with what we have. This was promised in January of 2019, but as of 8.1.5, it is still not here.
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nick.minchin
Momentary buttons are generally not a good idea to use for any SCADA system, as any disruption in comms either due to network, CPU load, memory usage, etc. could disrupt this and leave the bit high. I've seen this many many times in systems that, usually OEMs, have put in where this has been an issue. We will always convert these to auto-resetting bits in the PLC.
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Andrew Parry
nick.minchin: If we were talking conventional SCADA talking to a PLC I would agree with you - However, IMHO, perspective is best used for IIOT style projects - connecting to a far more diverse range of sensors / gateways etc. than old school SCADA systems. (many have none or little programmable logic so a momentary signal from the HMI / Dashboard / webpage is very useful. Currently if you want this functionality you have to add some scripting to the tag.
If someone doesn't understand the dangers of writing to PLCs or other logic devices then they probably shouldn't be doing it in the first place.
For old school SCADA vision is a far better option than Perspective anyway!