system.tag.writeToTag(<date>) fails to update tag

Ignition
1

I have created a read/write DateTime memory tag ‘[default]ping/LastPingStartTime’. It’s reading 1970-01-01 in the tag browser.
I’m trying to update it with the following test script.

import datetime

now = datetime.datetime.now()
print now
system.tag.writeToTag('[default]ping/LastPingStartTime', now)
print system.tag.read("[default]BAPL_ping/LastPingStartTime")
  • The print command reports the correct timestamp.
  • The tag.read reports the tag value correctly.
  • The tag doesn’t update.

Can anyone find my error?

2

That worked fine for me, did you set the Data Format on the tag?
Under the Metadata tab, set it to yyyy-MM-dd h:mm:ss aa

3

Yes, thank you. Data format is correct.
I wonder if I have a permissions problem?

Update:
The script console is giving me the following error. “Gateway Comm Mode is not Read/Write.”

Now where do I configure that?

Update 2:
Solved: Project | Comm Read/Write.
Turn that on and it all works.

Thanks.