ChZeman (Customer) asked a question.
I'm requesting JSON data from Node-RED and receiving the IP address the PLC should be using. I'm having trouble figuring out how to convert that string into 4 bytes SETUPIP can use.
How far have you gotten? Have you used JSONPARSE to extract the string value from the JSON object? That is, you have a string in (say) SS0 equal to the IP ipaddress "10.0.5.42". Or do you need help with the JSONPARSE? If so, please provide a sample Node-RED JSON object/array string.
Yes, I'm able to extract the data just fine from JSON and am storing the IP address in SS2. It's what to do with it from there that's giving me problems. I had attempted to use JSONPARSE to store the values in a data block but that provided me with values that were of a different type that I couldn't figure out how to convert from.
Use STR2INT to extract the first octet into D42:UB3, utilizing the "index where stopped" say to D99. This is the 0-based index where the "dot" is after the first octet
INC D99 will adjust the index past the dot
Then use STRSUB to get the substring started at D99. You can put it to a new string, or just back into SS2
Do STR2INT SS2 to put the 2nd octet into D42:UB2 (stop index in D99)
INC D99
STRSUB D99 back into SS2
STR2INT SS2 to put the 3rd octet into D42:UB1 (stop index D99)
INC D99
STRSUB D99 back into SS2
STR2INT SS2 to put the last octet into D42:UB0
You may want to use other string IDs and different D "stop index" for all 4 octets to help debug/understand what's going on.
D42 should now contain the DWORD value for 10.0.5.42.
Do-more PLCs use little endian, so the IP Address will be in that form in the DWORD (0x0A00052A), which is what the PLC firmware expects for an IP Address.
Use STR2INT to extract the first octet into D42:UB3, utilizing the "index where stopped" say to D99. This is the 0-based index where the "dot" is after the first octet
INC D99 will adjust the index past the dot
Then use STRSUB to get the substring started at D99. You can put it to a new string, or just back into SS2
Do STR2INT SS2 to put the 2nd octet into D42:UB2 (stop index in D99)
INC D99
STRSUB D99 back into SS2
STR2INT SS2 to put the 3rd octet into D42:UB1 (stop index D99)
INC D99
STRSUB D99 back into SS2
STR2INT SS2 to put the last octet into D42:UB0
You may want to use other string IDs and different D "stop index" for all 4 octets to help debug/understand what's going on.
D42 should now contain the DWORD value for 10.0.5.42.
Do-more PLCs use little endian, so the IP Address will be in that form in the DWORD (0x0A00052A), which is what the PLC firmware expects for an IP Address.