ABB PFBL141B/C Horizontal measuring sensor

The CS 275 bus system provides a means of communication between the individual components of the TELEPERM M system. The AS 23x system uses the N8 or N–AS interface module for participating in the data exchange. The N8/N–AS utilizes direct memory access (DMA) for communicating with the AS 23x system. Data is exchanged by means of “message frames”. The message frames used for data exchange consist of an address and a data section. The address contains the bus and device number of the receiver and a combination of block number and name. This message–related combination points to the different receiving areas in the AS 23x.

The following elements are distinguished in data exchange

 – Operator input/initialization message frames – Status message frames – Parameter accesses – Alarm message frames – Time message frames Message frames can be generated in all online and processing levels and transferred to the N8/N–AS interface module. The incoming message frame is processed on processing level 7 (PU7). Exceptions are the operator input message frames of the processing levels 10 and 14 (IU10/IU14) and the N8/N–AS flag interpretation on processing level 9 (IU9).

Monitoring of the Bus Interface Module

 A monitoring program is started every minute in an AS 23x system with bus interface module. This program requests an acknowledgement from the module. It is assumed that the module has been de–parameterized if this acknowledgement is not received within 15 seconds of the request. In this case, the bus interface module is automatically re–parameterized, and the system message S 398 N8/N–AS has been re–parameterized issued. If a parameterization cannot be performed, the system message

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