I have an old Siemens TI 505 PLC that works fine. I am looking to add and HMI for system information. I already have a Red Lion G315 that has not been used. I this PLC supported by Red Lion Crimson software?
Are you thinking of using serial or a 2572(or 2572-a card) to do ethernet?
From their driver list, They support the Siemans serial protocols and under the CTI list(CTI bought the TI505 line essentially, they manufacture replacement I/O and a new processor that is compatable the 2500) they have both the ethernet camp driver and the serial camp driver.
Under CTI you should find a serial and ethernet driver, if you have the 2572A ethernet module you can also use ModbusTCP; and lastly, if you have the Profibus expansion card for the G3 and have the TI505 PLC that has the Profibus port, you can use that fieldbus as well.