Iai-america XSEL-QX Manuel d'utilisateur télécharger pdf (Page 151)

100

101

127

Part 3 Controller Data Structure

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 below 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 (“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 ... 146 147 148 149 150 151 152 153 154 155 156 ... 557 558

Commentaires sur ces manuels

Pas de commentaire

Iai-america XSEL-QX Manuel d'utilisateur Page 151

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Iai-america XSEL-QX