YOKOGAWA SSB401-13 Interface Module

This modules is connected to a CAN Bus conforming to ISO-11898 as a single node. It can read the data frames that flow through the CAN Bus and output data frames and remote frames to the CAN Bus. The module receives frames by reading the frames transmitted by other nodes through the input/output connector (D-Sub 9 pin). If the frame is a data frame, it is retrieved using the CAN controller (SJA1000) by Philips that is isolated using a photocoupler in the CAN I/F block.

 The data frame is then written to the temporary buffer on the SRAM. As necessary, the data in the temporary buffer is re-sampled using a clock of a constant period and stored in the data memory within the SDRAM. The module transmits frames by downloading the transmission data frame or remote frame that is defined at the software level to the SDRAM via the DPRAM and passing the frame to the CAN controller (SJA1000). 

The module is capable of transmitting remote frames while acquiring data. The module is characterized by a local CPU that is dedicated to transmitting/receiving data to/from the CAN bus via the DPRAM and controlling the system according to the WE7000 firmware. The CPU runs according to the firmware in the flash ROM and issues CAN Bus input/output instructions to the controller. It also controls the functions to the left of the DPRAM in the above figure such as communicating with the WE7000 main CPU through the interface consisting of the DPRAM and interrupt signals.

 • Defining the order of control block implementation The implementation priority or order of performance can be determined among several function blocks described in the control drawing. 

 • Mix of Regulatory Control and Sequence Control Regulatory control and Sequence control can be mixed in Control drawing. Control functions can be flexibly configured according to the requirement for process.

 • Free Signal Flow between Control Drawing Function block belonging to different Control drawing can be connected to another Control drawing.

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