Network Instructions - Automationdirect.com DirectLOGIC DL205 Series User Manual

Network Instructions

Read from Network (RX)
The Read from Network instruction is used by the master device on
230
a network to read a block of data from another CPU. The function
240
parameters are loaded into the first and second level of the
250-1
accumulator stack and the accumulator by three additional
260
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 the PLC internal port (KF1) or
DS Used
slot number of the master DCM or ECOM (0 to 7) into the second byte of the second level
HPP Used
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
V-memory
Pointer
Inputs
Outputs
Control Relays
Stage
Timer
Counter
Global I/O
Special Relay
Chapter 5: Standard RLL Instructions - Network
DL240 Range
A aaa
V All (See page 3 - 54)
All V-memory
P
(See page 3 - 54)
X 0-477
Y 0-477
C 0-377
S 0-777
T 0-177
CT 0-177
GX/GY -
SP 0-137 540-617
DL250-1 Range
aaa
All (See page 3 - 55)
All V-memory
(See page 3 - 55)
0-777
0-777
0-1777
0-1777
0-377
0-177
-
0-777
DL205 User Manual, 4th Edition, Rev. B
RX
A aaa
DL260 Range
aaa
All (See page 3 - 56)
All V-memory
(See page 3 - 56)
0-1777
0-1777
0-3777
0-1777
0-377
0-377
0-3777
0-777
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