Brand: METSO

Type:PDP401

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

PROFIBUS DP, FOUNDATION Fieldbus H1, FOUNDATION Fieldbus High Speed Ethernet and dual RS-232C ports are some examples of unit types available for connection to the CEX-Bus. It is possible to use redundant communication interfaces, for example PROFIBUS DP. Figure 6 on page 38 provides examples of various ways to connect the S800 I/O units. It can be seen, at the top right-hand area of Figure 6 on page 38, that one cluster (or group) of units (maximum number of units per cluster is 12) is connected to the electrical ModuleBus of an AC 800M Controller. However, a further seven clusters (each comprising up to 12 units) can be added to the optical ModuleBus, thus achieving a total count of 96 units per AC 800M Controller when using only the ModuleBus. Connecting S800 I/O units (using the ModuleBus) to an AC 800M Controller mounted with a PM851/PM851A processor unit is restricted to, one electrical ModuleBus cluster and one optical ModuleBus cluster

To the left on Figure 6 on page 38, there is a PROFIBUS DP segment. This allows for a large increase in the numbers of units connected to each AC 800M Controller. Here the segment is shown as having an FCI unit (type CI801), connected to the PROFIBUS DP network. The use of FCI units allows the selection of units from several I/O families. Figure 7 on page 39 shows another example for I/O units based on a FOUNDATION Fieldbus High Speed Ethernet (FF HSE). For further examples refer to the relevant documentation for the I/O system in question.

PM891 is a high performance controller, which is capable of handling applications with high requirements. PM891 connects to the S800 I/O system through the optical Modulebus. It can act as a stand-alone Process Controller, or as a controller performing local control tasks in a control network. Two PM891 controllers can function together as a redundant pair, with one PM891 acting as the primary controller and the other acting as the backup. The backup controller takes over the process controller tasks if any hardware error occurs in the primary controller.