DL205 User Manual, 4th Edition, Rev. D
5-193
Chapter 5: Standard RLL Instructions
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A
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C
D
Network Instructions
Read from Network (RX)
The Read from Network instruction is used by the master device
on a network to read a block of data from another CPU. The
function parameters are loaded into the first and second levels of
the accumulator stack and the accumulator by three additional
instructions. Listed below are the steps necessary to program the
Read from Network function.
Step 1: Load the slave address (0 to 90 BCD) into the first byte, and load the PLC internal port
(KF1) or slot number of the master DCM or ECOM (0 to 7) into the second byte of the
second level of the accumulator stack.
Step 2: Load the number of bytes (0 to 128 BCD, multiple of 2) to be transferred into the first level
of the accumulator stack.
Step 3: Load the address of the data to be read into the accumulator. This parameter requires a HEX
value.
Step 4: Insert the RX instruction which specifies the starting V-memory location (Aaaa) where the
data will be read from in the slave.
Helpful hint: For parameters that require HEX values, the LDA instruction can be used to
convert an octal address to the HEX equivalent and load the value into the accumulator.
Operand Data Type DL240 Range DL250-1 Range DL260 Range
A aaa aaa aaa
V-memory V All (See page 3 - 54) All (See page 3 - 55) All (See page 3 - 56)
Pointer P
All V-memory
(See page 3 - 54)
All V-memory
(See page 3 - 55)
All V-memory
(See page 3 - 56)
Inputs X 0-477 0-777 0-1777
Outputs Y 0-477 0-777 0-1777
Control Relays C 0-377 0-1777 0-3777
Stage S 0-777 0-1777 0-1777
Timer T 0-177 0-377 0-377
Counter CT 0-177 0-177 0-377
Global I/O GX/GY - - 0-3777
Special Relay SP 0-137 540-617 0-777 0-777
A aaa
RX
230
240
250-1
260
DS Used
HPP Used
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