IAI America TT-C3 - Manual (Page 82)

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INTELLIGENT ACTUATOR
Chapter 3 X SEL Lanhuage Data
3.
Command
Part
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 (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.
Command Operand 1 Operand 2 Output
To the next step
Command Operand 1 Operand 2 Output
IF to THEN ELSE
p
Command Operand 1 Operand 2 Output