Rockwell PLC 1756-L72S-PLC programmable control system

Rockwell PLC 1756-L72S-PLC programmable control system

Technical data of product parameters

Electric Drive 1756-L72S types of Electric Drive modes are supported. Electric
Drive module types are available with group 4 Electronics modules only. The
mode of the Electric Drive is controlled through software.
— Electric Drive Type (Mode 1)
This type of module calculates the process variable from analog input 1, and
the output (Demand) is calculated by the Controller as in Normal (nonelectric drive) card styles. However, the output to the field are the two digital
outputs. The output (Demand) from the Controller is compared to the
process position (analog input 2), and raise and output pulses are generated
accordingly to control the process. Digital output 1 corresponds to raise and
digital output 2 corresponds to lower. The outputs are pulsed with the duty
cycle proportional to the speed of the raise or lower action. The raise/lower
ON/OFF times are specified in the control algorithm.
— Electric Drive Type (Mode 2)
As in Electric Drive (Mode 1), this type of module calculates the process
variable from analog input 1, and its field output are two digital outputs.
However, in all operating modes except Local, a demand of zero (0) will
force a hard (non-pulsing) lower. This means that digital output 2 will be
forced active LOW and will remain LOW until the demand is not equal to
0. Local mode operation is unchanged. 1756-L72S
For the Ovation single-loop interface module, the digital inputs perform the runback
function. The digital inputs are used as priority raise or lower for the output. Priority 1756-L72S
action takes precedence over any output request from the Controller or SLIM.
Runbacks may be used with either of the two module types (Normal (non-electric)
or Electric Drive).
If desired, digital inputs can be disabled as runbacks and used as user-defined
points. In order to disable digital inputs as runback functions, the module must be 1756-L72S
configured per instructions on drawingThe single-loop interface module may communicate to the Small Loop Interface
Module (SLIM) via its RS-422 serial port. The serial port connector is located on
the personality module. Alternatively, the serial port wiring may be connected
directly at the terminal block.
A single SLIM will communicate with one loop interface module. Multiple-loop
interface modules per single SLIM are not supported. SLIMs are not required for
the loop interface module operation.

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