Rockwell Structure text Question

[toddp65]

I'm working with a project that contains some routines in ST but mostly in ladder. Am I correct in assuming this 'rung':
DB1001DO._01AV55_OPEN := DB370._01AV55.OUT_VALVE_OPEN is basically a move instruction moving DB1001DO._01AV55_OPEN to the right side of the equals? Like 1:1?
Been watching some YouTube vids on ST trying to get caught up.

Thanks

 

[jstolaruk]

":=" means "is equal by definition to", move would be one of the ladder instructions that falls under that definition.

 

[geode]

I'm working with a project that contains some routines in ST but mostly in ladder. Am I correct in assuming this 'rung':
DB1001DO._01AV55_OPEN := DB370._01AV55.OUT_VALVE_OPEN is basically a move instruction moving DB1001DO._01AV55_OPEN to the right side of the equals? Like 1:1?
Been watching some YouTube vids on ST trying to get caught up.

Thanks

It looks like you have it backwards. The right side of the := is moved to the left

To move DB1001DO._01AV55_OPEN to DB370._01AV55.OUT_VALVE_OPEN it should be

DB370._01AV55.OUT_VALVE_OPEN := DB1001DO._01AV55_OPEN;

 

[drbitboy]

The value goes the other way i.e. right to left, i.e. that statement assigns the value of variable (tag) DB370._01AV55.OUT_VALVE_OPEN at the time the statement executes to the variable DB1001DO._01AV55_OPEN.

 

[toddp65]

ok, right to left. I just copied the line from the program and assumed the logic moved left to right like ladder. I believe it's taking a valve call and assigning a 1 to the HMI indicator light for the valve on the graphic indicating Green, or Open.