Shcneider Electric. Reference manual. PL7 Micro/Junior/Pro. Description of the PL7 software
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Instruction list language
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Structure for an instruction list program
General points Just as with contact language, instructions are organized in instruction sequence
(equivalent to a contact network) called a sequence.
Example of a
sequence
The following illustration shows a PL7 instruction list sequence.
Description of a
sequence
Each sequence begins with an exclamation mark (generated automatically). It
includes the following elements.
!(*Awaiting drying*)
%L2:
LD %I1.0
AND %M10
ST %Q2.5
1
2
3
Address Element Function
1 Comments Enter a sequence (optional).
2 Label Locate a sequence (optional).
3 Instructions One or more test instructions, the result of these instructions
being applied to one or more action instructions.
One instruction takes up a maximum of one line
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Label for a sequence in instruction list language
General points The label is used to locate a sequence in a program entity (main program, sub-
program,…). It is optional
Syntax This label has the following syntax: %Li with i between 0 and 999. It is at the
beginning of a sequence.
Illustration The following program shows how the label is used.
Rules The same label can only be allocated to a single sequence within the same program
entity.
It is necessary to label a sequence so that connection can be made after a program
jump.
The order of label addresses does not matter, (it is the order of entering the
sequences that is taken into account by the system when scanning).
Label
%L0:
LD %M40
JMPC %L10
!(*Awaiting drying*)
%L2:
LD %I1.0
AND %M10
ST %Q2.5
...
%L10:
LD%I3.5
ANDN %Q4.3
OR %M20
ST %Q2.5
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Comments on a sequence in instruction list language
General points The comments make interpreting a sequence to which they are assigned easier.
They are optional.
Syntax The comments can be integrated at the beginning of a sequence and can take up
up to 3 lines (i.e. 222 alphanumeric characters), on either side of which are the
characters (* and *).
Illustration The following illustration locates the position of the comments in a sequence.
Rules The comments are only displayed from the first line of the sequence.
If a sequence is deleted, the comments with it are also deleted.
The comments are stored in the PL7 and can be accessed by the user at any time.
In this case they take up program memory.
!(*Awaiting drying*)
%L2:
LD %I1.0
AND %M10
ST %Q2.5
Comments
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Presenting instructions in instruction list language
General points The instruction list language is made up of the following :
z test instructions
z action instructions
z on a function block
z numerical
Test instructions The following table describes test instructions in instruction list language.
Name Equivalent
computer art
Functions
LD The Boolean result is the same as the status of the
operand.
LDN The Boolean result is the same as the reverse status of the
operand.
LDR The Boolean result changes to 1 on detection of the
operand (rising edge) changing from 0 to 1.
LDF The Boolean result changes to 1 on detection of the
operand (falling edge) changing from 1 to 0.
AND The Boolean result is equal to the And logic between the
Boolean result of the previous instruction and the status of
the operand.
ANDN The Boolean result is equal to the And logic between the
Boolean result of the previous instruction and the reverse
status of the operand.
ANDR The Boolean result is equal to the And logic between the
Boolean result of the previous instruction and the detection
of the operand's rising edge (1 = rising edge).
ANDF The Boolean result is equal to the And logic between the
Boolean result of the previous instruction and the detection
of the operand's falling edge (1 = falling edge).
OR The Boolean result is equal to the Or logic between the
Boolean result of the previous instruction and the status of
the operand.
ORN The Boolean result is equal to the Or logic between the
Boolean result of the previous instruction and the reverse
status of the operand.
P
N
P
N
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ORR The Boolean result is equal to the Or logic between the
Boolean result of the previous instruction and the detection
of the operand's rising edge (1 = rising edge).
ORF The Boolean result is equal to the Or logic between the
Boolean result of the previous instruction and the status of
the operand and the detection of the operand's falling edge
(1 = falling edge).
AND( Logic And (8 parenthesis levels)
OR( Logic Or (8 parenthesis levels)
XOR, XORN,
XORR, XORF
- Exclusive Or
MPS
MRD
MPP
Switching to the coils.
N - Negation
Name Equivalent
computer art
Functions
P
N
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Action
instructions
The following table describes test instructions in instruction list language.
Instruction on a
function block
The following table describes test instructions in instruction list language.
Name Computer art Functions
ST The associated operand takes the value of the test field
result.
STN The associated operand takes the reverse value of the test
field result.
S The associated operand is set to 1 when the result of the
test field is 1.
R The associated operand is set to 0 when the result of the
test field is 1.
JMP - is used to connect unconditionally to a labeled sequence,
upstream or downstream.
JMPC - is used for a conditioned connection to a Boolean result at
1, to a labeled sequence upstream or downstream.
JMPCN - is used for a conditioned connection to a Boolean result at
0, to a labeled sequence upstream or downstream.
SRn - Connection at the beginning of a sub program.
RET - Return of the sub-program
RETC - Return of the conditioned sub program to a Boolean result
at 1.
RETCN - Return of the conditioned sub program to a Boolean result
at 0.
END - End of program.
ENDC - End of the conditioned program at a Boolean result of 1.
ENDCN - End of the conditioned program at a Boolean result of 0.
S
R
Name Computer art Functions
Timer blocks,
counter, monostable,
register, cyclical
programmer
For each of the standard function blocks, there are
instructions for controlling the block.
A structured form is used to hardwire the block
inputs and outputs directly.
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Numeric
instructions
The following table describes test instructions in instruction list language.
Name Instructions Functions
Test element LD[.....]
AND[.....]
OR[.....]
is used to compare 2 operands. The output goes to
1 when the result is checked.
Example : LD[%MW10<1000]
Result to 1 when %MW10<1000.
Action element [.....] carry out arithmetic logic operations…
use the structured text language syntax.
Example : [%MW10:=%MW0+100]
The result of the %MW0+100 operation is placed in
the internal word %MW10.
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Rule for using parentheses in instruction list language
General points The instructions AND and OR can use parentheses.
These parentheses are used to make up simple contact diagrams.
Principle Opening parentheses is associated with the instruction AND or OR.
Closing parentheses is an instruction. It must be done for each open parenthesis.
Example: AND( The 2 following programs show how parentheses are used.
Example: OR( The following program shows how the parenthesis is used.
LD %I1.0
AND %I1.1
OR %I1.2
ST %Q2.0
LD %I1.0
AND( %I1.1
OR %I1.2
)
ST %Q2.0
LD %I1.0
AND %I1.1
OR(N %I1.2
AND %I1.3
)
ST %Q2.0
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Associating
parentheses to
modifiers
The following "modifiers" can be associated with parentheses.
Overlapping of
parentheses
It is possible to overlap up to 8 parenthesis levels.
The following rules must be observed:
z Each open parenthesis must be closed
z The labels %Li: must not be put in expressions in parentheses, or the jump
instructions JMP and calling up sub program instructions SRi,
z Assigning instructions ST, STN, S and R must not be programmed in parentheses.
Example:
The following programs show how to use overlapping of parentheses.
Code Role Example
N Negation AND(N
F Falling edge AND(F
R Rising edge OR(R
[ Comparison OR([%MW0>100]
LD %I1.0
AND( %I1.1
OR(N %I1.2
AND %M3
)
)
ST %Q2.0
LD %I1.1
AND( %I1.2
AND %I1.3
OR(N %I1.5
AND %I1.6
)
AND %I1.4
OR(N %I1.7
AND %I1.8
)
)
ST %Q2.0
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Description of the MPS, MRD and MPP instructions
General points The 3 instruction types are used to switch to the coils.
These instructions use an intermediate memory called a stack which can store up to
3 Boolean instructions…
Role The following table describes the role of each of the instructions
Example 1 This example shows how to use the MPS, MRD and MPP instructions.
Note: these instructions cannot be used in an expression in parentheses
Instruction Role
MPS (Memory PuSh) This instruction stores the results of the last test instruction at
the top of the stack and moves the other values to the bottom
of the stack.
MRD (Memory ReaD) This instruction reads the top of the stack.
MPP (Memory PoP) This instruction reads, draws down the top of the stack and
moves the other values towards the top of the stack.
LD %I1.0
AND %M0
MPS
AND %I1.1
ST %Q2.0
MRD
AND %I1.2
ST %Q2.1
MRD
AND %I1.3
ST %Q2.2
MPP
AND %I1.4
ST %Q2.3