READ_PCMCIA and WRITE_PCMCIA Example

Objectives

This example shows how to use the READ_PCMCIA and WRITE_PCMCIA function blocks by:

Writing values from words (%MW100 to %MW109) to a memory card.
Reading values from the memory card to words (%MW110 to %MW119).

NOTE: In this example, to use those function blocks, a memory card must be connected into the PLC.

Configuration of the CPU

In this example, the TSX MRP C007M SRAM memory card is connected into the upper slot A of the CPU (parameter SLOT = 0 for the functions blocks). In addition, for data storage purposes, the CPU is configured with 2000 kB of memory.

NOTE: The data storage is used for READ_PCMCIA and WRITE_PCMCIA function blocks. The 2000 kB of data storage represents:

The READ_PCMCIA and WRITE_PCMCIA functions are working with word addresses:

Addresses from 0 to 1024000 for the memory card can be used.

Programming the MAST section

In the MAST section of the program, program as follows:

The memory card is connected into slot 0.
The WRITE_PCMCIA function writes 10 words to address 10000 on the memory card from %MW100.
The READ_PCMCIA reads 10 words from address 10000 on the memory card to %MW110.

Representation of WRITE_PCMCIA and READ_PCMCIA in FBD language:

Representation of WRITE_PCMCIA and READ_PCMCIA in ST language:

WRITE_PCMCIA (0,10000,10,100,Status_write);

READ_PCMCIA (0,10000,10,110,Status_read);

Testing the Example

By using animation tables with words: %MW100 to %MW119, the values from %MW100 to %MW109 are copied to %MW110 to %MW119 via the memory card.