# Handshake Speed

**URL:** <https://forum.inductiveautomation.com/t/handshake-speed/104638>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [April 3, 2025, 9:56am UTC](https://forum.inductiveautomation.com/t/handshake-speed/104638 "2025-04-03T09:56:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ros\_Alexander1](https://avatars.discourse-cdn.com/v4/letter/r/db5fbb/32.png) [@Ros\_Alexander1](https://forum.inductiveautomation.com/u/Ros_Alexander1)\
**Post date:** [April 3, 2025, 9:56am UTC](https://forum.inductiveautomation.com/t/handshake-speed/104638/1 "2025-04-03T09:56:23Z")

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We are running into issues with catching the handshake consistently in our PLC. We are using transaction groups to gather machine data. Once we trigger the transaction group, I have selected the handshake option for success and failure within the transaction group. What seems to be happening is the PLC is only catching the handshake every 2-3 times. We fixed it by adding a timer. I couldn't find anything online about how long ignition will keep that bit high or who conditions are set for the handshake options within the transaction group.

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [April 3, 2025, 10:24am UTC](https://forum.inductiveautomation.com/t/handshake-speed/104638/2 "2025-04-03T10:24:11Z")

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Is the plc clearing the handshake bit itself anywhere in the logic?

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<div class="post-metadata">

**Author:** ![Ros\_Alexander1](https://avatars.discourse-cdn.com/v4/letter/r/db5fbb/32.png) [@Ros\_Alexander1](https://forum.inductiveautomation.com/u/Ros_Alexander1)\
**Post date:** [April 3, 2025, 10:42am UTC](https://forum.inductiveautomation.com/t/handshake-speed/104638/3 "2025-04-03T10:42:49Z")

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It is not. Will the ignition handshake stay high until it's cleared?

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [April 3, 2025, 11:47am UTC](https://forum.inductiveautomation.com/t/handshake-speed/104638/4 "2025-04-03T11:47:52Z")

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The handshake in a transaction group is just a single write that fires off on success or failure. What happens to that tag afterwards is up to you.