General on the PID
General introduction
General The regulation functions are the standard elements of the PL7 language.
They support programming of the regulation loops of the Micro and Premium PLC’s.
These functions are particularly adapted to: l answering the needs of the sequential process which need the auxiliary adjustment functions (examples: Plastic film packaging machine, finishing treatment machine, presses…), l respond to the needs of the simple adjustment process’ (examples: metal furnaces, ceramic furnaces, small refrigerating groups…), l respond to the automatic control features or to the mechanical regulation which has a critical sampling time (examples: torque regulation, speed regulation).
A pre-configured interface with the CCX_17 range supports the driving and the adjustment of the regulation loops. In this area, up to 9 regulation loops are accessible via the CCX_17.
Available functions
Note: There is not a limit to the number of PID functions that are available in a function. In practice, it is the maximum number of input and output modules which are accepted by the PLC that limits the number of loops.
The standard regulation functions are split into two categories: l a family of algorithm functions: l l
PID function to execute a mixed PID correction (serial – parallel),
PWM function to execute the modulation adjustment period on the discrete l l outputs,
SERVO function to execute the motor command adaptations, an operator dialogue function (PID_MMI) which integrates a driving and adjustment application for the PID application on CCX_17 version 2.
The PID_MMI function is linked to 3 types of pre-configured screens.
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TLX DS 37 PL7 xxE
