1 -8
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Network: Network is a circuit representing a specified function. It consists of the elements, branches, and blocks.
Network is the basic unit in the Ladder Diagram which is capable of executing the completed functions, and the
program of Ladder Diagram is formed by connecting networks together. The beginning of the network is the
origin line. If two circuits are connected by a vertical line, then they belong to the same network. If there is no
vertical line between the two circuits, then they belong to two different networks. Figure 1, shows three (1
～
3)
networks.
1.4
The Coding Rules of Mnemonic
(Users of WinProladder can skip this section)
It’s very easy to program FB-PLC with WinProladder software package, just key-in the ladder symbols as they appear on
your CRT screen directly to form a ladder diagram program. But for the users who are using FPC-07 to program FB-PLC
they have to translate ladder diagram into mnemonic instructions by themselves. Since FPC-07 only can input program with
mnemonic instruction, this section till section 1.6 will furnish you with the coding rules to translate ladder diagrams into
mnemonic instructions.
z
The program editing directions are from left to right and from top to bottom. Therefore the beginning point of the network
must be at the upper left corner of the network. Except the function instruction without the input control, the first instruction
of a network must begin with the ORG and only one ORG instruction is permissible per network. Please refer to section
6.1.1 for further explanations.
ORG X 0
AND X 1
LD X 2
OR X 3
AND X 4
ORLD
Example:
X0
X2
X3
X1
X4
X5
Ö
AND X 5
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Using LD instruction for connecting vertical lines (origin line or branch line) except at the beginning of the network.
ORG M 0
LD X 0
AND X 1
Example 1:
X0
M0
X1
Ö
ORLD
AND Y 0
LD M 0
AND M 1
LD X 0
AND X 1
Example 2:
X0
M0
X1
M1
Y0
Ö
ORLD
Remark 1: Using the AND instruction directly if only one row of elements is serially connected to the branch line.
AND X 0
ORLD
AND Y 0
Example:
X0
Y0
Ö
