# OPC Write Stop Work All Functions

**URL:** <https://forum.inductiveautomation.com/t/opc-write-stop-work-all-functions/21076>\
**Category:** Ignition\
**Created:** [November 27, 2018, 1:32pm UTC](https://forum.inductiveautomation.com/t/opc-write-stop-work-all-functions/21076 "2018-11-27T13:32:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![juan.chavarria](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@juan.chavarria](https://forum.inductiveautomation.com/u/juan.chavarria)\
**Post date:** [November 27, 2018, 1:32pm UTC](https://forum.inductiveautomation.com/t/opc-write-stop-work-all-functions/21076/1 "2018-11-27T13:32:07Z")

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Hello, I have a problem in a project, I am already contacting support but I would like to see if you can also help me here:

I have a system where 240 parameters of a database are downloaded with a query, then they are written in blocks of 80 OPC tags of an OPCServer (Top Server) using the system.opc.writeAll function … In this system, others are written tags but of 1 in or maximum of 3 in 3 … but when those 80 are written in a single stroke the ignition stops … other functions that are running in parallel stop working, writing memory tags, opc in other functions are not performed, the whole system is slowed down.

I have no idea what may be happening, but the tags do not have them imported into the ignition, I thought that if writing to the PLC was done it would be more efficient … I do not know if it will be the function that has problems or the OPCServer, someone Have you had this problem? The PLC is an Allen Bradley

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [November 27, 2018, 1:44pm UTC](https://forum.inductiveautomation.com/t/opc-write-stop-work-all-functions/21076/2 "2018-11-27T13:44:42Z")

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Sounds like a bug. I often perform similar large reads and writes via `system.opc.*` functions from/to a variety of Allen-Bradley products, including really old stuff on slow comms channels. The only major slowdown I’ve encountered was due to the one-message-per-scan configuration bit in some old SLC processors. All of this using Ignition’s native OPC drivers. I’ve never used Top Server.