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Data read/write ladders in block transfer

[1] Outline

Various data is transferred in 64-byte size blocks to transfer (read/write) data to the JW-12PS/14PS

side from the JW50H/70H/100H control module. For example, to transfer all the block data of the X-

and Y-axes (or, Z- and A-axes), transfer must be performed 128 times (64 times). The total block

data per axis is 2048 bytes. As there is not enough space in the regular registers of file 0, separate

file memory must be registered. Pages 5-40 to 5-45 show an example of a ladder program for

transferring (reading/writing) block data for four axes to file 1. Appendix 5 shows a table of the

positioning data that is assigned to file 1 at this time.

Only block data for the required blocks can be transferred, so there is no need to always use this

example ladder program. Also, when using only direct operation, repeated block transfer is not

needed as only the values of regular parameter 1 (block data 0) are transferred. With direct

operation, using the ladder program (page 5-33) for transferring the data of individual desired

blocks comes in handy.

Brief description of writing by the sample ladder program

PC side data memory

Block data

JW-12PS/14PS side

Shared RAM

Output relay

(16 bytes/axis)

Total 64 bytes

Write data area

for block transfer

(common to all axes)

64 bytes

X-axis block 00

X-axis block 31

Y-axis block 00

Y-axis block 31

Z-axis block 00

Z-axis block 31

A-axis block 00

A-axis block 31

Output relay

(16 bytes/axis)

Total 64 bytes

Write data area

for block transfer

(common to all axes)

64 bytes

Block data on the PC

side is written in

order to PS operation

data area by output

relays in 64 bytes.