Sending string about node-red-contrib-s7 HOT 3 CLOSED

Your string seems to be too big. Strings have a single byte on their start to store the max. length, and another byte to store the current length, limiting the size of a string to 0~255 characters.

Also keep in mind that these 2 bytes must be accounted for when calculating the space needed. If you have 256 bytes available (304.0 - 48.0 = 256), then your string can have a max length of 254. Therefore, your tag should be DB600,S48.254.

Another option is to use a char array instead of a string, so you don't have this limitation. But then you have to keep track of used bytes elsewhere, and handle this both on Node-RED and in your PLC program

from node-red-contrib-s7.

Well.. That makes sense.. and fixes my problem. Hmmm... Thanks for quick help :)

from node-red-contrib-s7.

Great, you're welcome!

from node-red-contrib-s7.