Iai-america XSEL-KET Uživatelský manuál stáhnout pdf (Strana 108)

Part 3 Controller Data Structure

INTELLIGENT ACTUATOR

3. Command Part

The primary feature of SEL language is its very simple command structure. Since the structure is

simple, there is no need for a compiler (to translate into computer language) and high-speed

operation is possible via an interpreter (the program runs as commands are translated).

3-1 SEL language Structure

The table bel

ow shows the structure of one command step.

Command, declaration

Extension condition

(AND, OR)

Input condition

(I/O, flag)

Command,

declaration

Operand 1 Operand 2

Output

(Output port, flag)

Using a ladder diagram, this is expressed as follows:

(1) The condition before the command is equivalent to “IF ~ THEN…” in BASIC.

1. If the input condition is satisfied, the command will be executed. If there is an output specification, the

specified output port will be turned ON. If the input condition is not satisfied, the program will proceed

to the next step regardless of the command that follows (e.g., WTON, WTOF). Obviously nothing will

happen at the output port, but caution must be exercised.

2. If no condition is set, the command will be executed unconditionally.

3. To use the condition in reverse logic (so-called “contact b logic” ), add "N" (NOT) to the

condition.

4. The input condition supports input port, output port and flag.

5. The operand 1, operand 2 and output fields can be specified indirectly.

(2) The output field, which follows the command, operand 1 and operand 2 fields, will specify the following

action:

1. In the case of a control command relating to actuator operation, etc., the output will turn OFF the

moment the execution of command is started, and turn ON when the execution is completed. In the

case of a calculation operation command, etc., the output will turn ON if the result corresponds to a

certain value, and turn OFF if not.

2. The output field supports output port and flag.

To the next step

Command

Operand 1 Operand 2

Output

Command

Operand 1

Operand 2

Output

IF ~ THEN ELSE



Command

Operand 1

Operand 2

Output

1 2 ... 103 104 105 106 107 108 109 110 111 112 113 ... 435 436

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