DL205 User Manual, 4th Edition, Rev. B
5–192
Chapter 5: Standard RLL Instructions - Intelligent I/O
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Write to Intelligent Module (WT)
The Write to Intelligent Module instruction writes a block of data
(1 to 128 bytes maximum) to an intelligent I/O module from a
block of V-memory in the CPU. The function parameters are
loaded into the first and second level of the accumulator stack and the accumulator by three
additional instructions. Listed below are the steps necessary to program the Read from
Intelligent module function.
Step 1: Load the base number (0 to 3) into the first byte and the slot number (0 to 7) into the second
byte of the second level of the accumulator stack.
Step 2: Load the number of bytes to be transferred into the first level of the accumulator stack.
(maximum of 128 bytes)
Step 3: Load the intelligent module address which will receive the data into the accumulator. This
parameter must be a HEX value.
Step 4: Insert the WT instruction which specifies the starting V-memory location (Vaaa) where the
data will be written from in the CPU.
Helpful hint: — Use the LDA instruction to convert an octal address to its HEX equivalent
and load it into the accumulator when the hex format is required.
NOTE:
Status flags are valid only until another instruction uses the same flag.
In the following example, when X1 is on, the WT instruction will write six bytes of data to an
intelligent module in base 1, slot 2 starting at address 0 in the intelligent module and copy
the information from Vmemory locations V1400–V1402.
þ
þ
þ
þ
230
240
250-1
260
St
an
da
rd
V aaa
WT
Direct
SOFT
Handheld Programmer Keystrokes
LD
K0102
X1
The constant value K0102
specifies the base number
(01) and the base slot
number (02)
LD
K6
The constant value K6
specifies the number of
bytes to be written
LD
K0
The constant value K0
specifies the starting address
in the intelligent module
WT
V1400
V1400 is the starting
location in the CPU where
the specified data will be
written from
V1401 7 8 5 6
V1402 0 1 9 0
V1403 X X X X
V1404 X X X X
V1377 X X X X
V1400 3 4 1 2
Data
12
34
56
78
90
01
Address 0
Address 1
Address 2
Address 3
Address 4
Address 5
CPU
Intelligent Module
1
B
ENT
0
A
STR
$
SHFT
ANDST
L
3
D
SHFT
ANDN
W
PREV
4
E
0
A
1
B
0
A
2
C
ENT
6
G
SHFT
ANDST
L
3
D
PREV
ENT
0
A
SHFT
ANDST
L
3
D
PREV
ENT
MLR
T
1
B
0
A
ENT
Discrete Bit Flags
Description
SP54
On when RX, WX, RD, WT instructions are executed with the wrong parameters.
Operand Data Type
DL230 Range
DL240 Range
DL250-1 Range
DL260 Range
aaa
aaa
aaa
aaa
V-memory V
All (See page 3 - 53)
All (See page 3 - 54)
All (See page 3 - 55)
All (See page 3 - 56)
DS
Used
HPP Used
