Read node not working

[chrisegge]

For some reason the "Read" Ignition Node is not working. The write Node is working. And when I use the same ignition server and Tag path in the read Node that is working in the Write Node it still does not work. The quality "Good" is false and it says it cannot locate tag. It has read and write privileges on all devices installed. Thanks for any help in advance.

[iatraviscox]

Can you post an example flow with the issue and your tag backup in Ignition?

[chrisegge]

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Typically, when you read a\ntag, it has to fetch the data type first. This only\nhappens the first time you read a uniuqe tag name. Once\nwe have read a tag, we remember the type.\n\nIf you have, for example, 1000 tags to read and they are\nall unique, you would have have to fetch the data type,\nthen the value, which is quite a bit of overhead.\n\nIf you pass the data type up front, it will skip that\ninitial read...\n'''\nfrom pylogix import PLC\n\ntag_list = ['L1_Seasoning_SPI_DIN_Discrete_Output.0', 'L1_Seasoning_SPI_DIN_Discrete_Output.1',\n'L1_Seasoning_SPI_DIN_Discrete_Output.2','L1_Seasoning_SPI_DIN_Discrete_Output.3',\n'L1_Seasoning_SPI_DIN_Discrete_Output.4','L1_Seasoning_SPI_DIN_Discrete_Output.5',\n'L1_Seasoning_SPI_DIN_Discrete_Output.6','L1_Seasoning_SPI_DIN_Discrete_Output.7',]\n\nwith PLC() as comm:\n comm = PLC()\n comm.IPAddress = '192.168.10.21'\n value = comm.Read(tag_list)\n print(value)\n comm.Close()\n\n \nmsg = {'payload':value}\nreturn msg;\n\n","outputs":1,"x":380,"y":100,"wires":[["df5c3876.0c4ff8","44690c80.8d0644","747419df.0e4c98","d7f8b5cf.f37838","46378bcc.30b4c4","2f03357e.6983da","137850f5.863d4f","492c84eb.66d22c"]]},{"id":"df5c3876.0c4ff8","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[0]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":100,"wires":[["782fb920.db95e8"]]},{"id":"44690c80.8d0644","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[1]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":140,"wires":[["9c40fe5a.f5677"]]},{"id":"747419df.0e4c98","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[2]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":180,"wires":[["6ac3de1b.ea453"]]},{"id":"d7f8b5cf.f37838","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[3]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":220,"wires":[["40e1d5a2.d6c64c"]]},{"id":"46378bcc.30b4c4","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[4]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":260,"wires":[["72c51017.3f798"]]},{"id":"2f03357e.6983da","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[5]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":300,"wires":[["2581449d.6076cc"]]},{"id":"137850f5.863d4f","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[6]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":340,"wires":[["b2fcb0.ec54135"]]},{"id":"492c84eb.66d22c","type":"change","z":"7855a877.f56ea8","name":"","rules":[{"t":"move","p":"payload[7]","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":840,"y":380,"wires":[["2a956020.23"]]},{"id":"62737bd.4632084","type":"rbe","z":"7855a877.f56ea8","name":"","func":"rbe","gap":"","start":"","inout":"out","property":"payload","x":290,"y":700,"wires":[["d489ffe8.ab107"]]},{"id":"d346d24b.f7f27","type":"inject","z":"7855a877.f56ea8","name":"","topic":"","payload":"","payloadType":"date","repeat":".50","crontab":"","once":false,"onceDelay":0.1,"x":110,"y":100,"wires":[["ced908eb.c82f28"]]},{"id":"df93e552.492158","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":760,"wires":[["691c0fed.4b84"],["2cc1682d.7e86f8"]]},{"id":"ccf7f6dc.a258f8","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":820,"wires":[["6c75f70a.021088"],["e0424366.46f1b"]]},{"id":"f8ae55d7.9bf158","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":880,"wires":[["dd67dbfc.5c1cf8"],["937cea71.264268"]]},{"id":"168a1246.90cc9e","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":940,"wires":[["a4aef6f4.b521f8"],["e22b04f7.3d35b8"]]},{"id":"7bbf372b.ba5018","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":1000,"wires":[["b645c0e2.47ab9"],["d7298e0b.debc8"]]},{"id":"cd1ba340.9045b","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":1060,"wires":[["d48679f5.0416f8"],["ca1f4cfa.fb80d"]]},{"id":"cccecef5.07352","type":"switch","z":"7855a877.f56ea8","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":true,"outputs":2,"x":490,"y":1120,"wires":[["ba82b19f.6aaa5"],["544184a4.448b9c"]]},{"id":"691c0fed.4b84","type":"ignition-tag-write","z":"7855a877.f56ea8","server":"7446865.6542978","value":"","valueType":"msg.payload","tagPath":"Edge 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That is the flow I am using right now. I added the read node at the bottom of the flow. I am not sure how to do a tag backup. i am using only two INT tags that i am using as two Byte arrays.

[chrisegge]

i think i figured out, it says not found when trying to read a value from a BYTE array but if i make a derived tag from that value in that BYTE array it reads the tag fine