04-09_wireless-Troncoso_fig1.htm (Sep-2004)

Fig. 1. (A) Phase 1, as completed in 2002. Loma La Lata's main gas plant, a smaller gas/ amine plant, field production control room and maintenance office were modernized with digital plant architecture. The main gas plan includes three redundant digital controllers, four PC operator workstations and one PC application station. Two controllers were assigned to process control functions, the third to plant security. The application workstation was placed on the Repsol-YPF intranet to provide management access to real-time / historic data.

The smaller, gas/amine plant was similarly modernized with two redundant digital process controllers, one security controller and three operator workstations. A workstation was added in Maintenance for configuration and interface to an AMS Suite asset management system. Last, in-plant data communications, plus communications between plants and offices, were networked on Ethernet.

(B), Loma La Lata wells, at the end of Phase 1, remained under control of Emerson's Model 312 remote operating controllers. Up to 10 wells communicate to a retained Model 364 ROC at each of the field's 14 primary separation units via 9,600 bps spread-spectrum FM radio. To each PSU was added a new Delta V controller running a new compressor station and its local HMI panel. The ROC was temporarily retained. The controller communicated with the local panel and the ROC unit via hardwired 9,600 bps Modbus RS-485 links. The ROC in turn communicated with Field Production via 9,600 bps spread-spectrum radio using the ROC protocol.