| News | |
 | www.maxwright.co.uk info@maxwright.co.uk |
| Martin Control Panels | Systems & Software | Search | MPS News | Instrumentation | Motor Control Centres | Busbar Systems | Documentation | Careers | Where We Are |
The control panel is a wardrobe type construction, housing the Allen Bradley SLC PLCs, level instruments and the MMIs. This control panel interfaces with the MCC via hardwired cabling and with the power station DCS via a dual redundant Modbus link. Two MMIs are mounted on the front of the control panel, one for displaying animated mimics of the plant and the other for displaying alarms, setpoints and sequence monitoring.
Two Allen Bradley SLC CPUs operate simultaneously, as a hot-standby system. Both CPUs use the same I/O which is via Remote IO. Hot-standby means that if the Primary CPU fails the secondary CPU becomes the Primary and continues to control the plant. The modbus link to the DCS system is effectively two modbus links in parallel, but only one is used at any one time. If one of these links fails the DCS detects this and starts using the data supplied on the other modbus link.
The control panel is fitted with a modem which allows Max Wright software engineers to talk directly to the PLCs and the MMIs in the control panel once on site in Malaysia. This means changes can be made to the software from the UK, without the costs of somebody going to site or the delay.
© Max Wright Limited 2003. This HTML document and its contents must not be reproduced for any purpose without written permission.