Calling Siemens 300 Tags


I am very new to connecting a Siemens PLC to Ignition- I have connected it and am reading 1 boolean tag. I am trying to connect to a word tag that appears to be in a DB? I am not sure what the exact structure should be. The tag is DB50.DBW154.
Any advice?
The syntax is: [s7_300]DB50,W154 or [s7_300]DB50,I154