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1771-PDC
Allen Bradley PLC-5 2 Loop PID Control Module

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2 year warranty 2 year warranty*

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*Manufacturer's warranty does not apply

PLC-5 2 Loop PID Control Module
Description

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The Proportional/Integral/Derivation Control (2-loop) Module Assembly (AB 1771-PD) is an intelligent I/O module that performs closed loop PID control. The PID module is a process controller and monitors the analog input process variable, compares the input to the desired set point and calculates the analog output control variable based on the control algorithm programmed in the module. The Allen Bradley 1771-PD PID module has the hardware inputs and outputs and microprocessor to perform PID control.

Capabilities of the 1771-PDC PID Module

The PID module can control one or two PID closed loops. The two loops can be independent or linked together by and advanced control function such as cascade or decoupling. Expanded loop features can be chosen in addition to standard features to suite the application. All features are software selectable with the exception of the I/O range, the source of +5V DC, and the fault response to a hardware failure (which are selected using internal programming plugs). Write block transfers to the module allow program logic to enable the following features:

Standard Features for Input Conditioning:
  • Detect the loss of process variable input
  • Read the process variable at the PC processor
  • Substitute a value from the PC processor for the process variable
  • Take the square root of the process variable
  • \digitally filter the process variable
Standard Control Features
  • Select direct or reverse acting control
  • Download a set point from the PC processor
  • Limit and/or set an alarm on the error signal
  • Download a dead band value from the PC processor
  • Perform error dead band (zero crossing)
  • Set an alarm when the error exceeds the dead band
  • Select the control mode: proportional only, integral only, proportional and integral, proportional and derivative, or all three 
  • Select error or error squared conditioning of the proportional and/or integral error
  • Select whether the derivative function operates on the error or the process variable
  • Set an alarm on the proportional term
  • Limit and/or set an alarm on the integral term
  • Limit and/or set an alarm on the derivative term
Standard Features for Output Conditioning
  • Limit and/or set an alarm on the PID algorithm output
  • Read the PID algorithm output at the PC processor
  • Download an output value from the PC processor
  • Interface directly with a manual control station (bumpless transfer)
  • Hold the PID algorithm output for independent loop tuning
  • Hold the bias/feed forward term for independent loop tuning
  • Download an output bias from the PC processor
Expanded Control Features
  • Perform scaling on the process variable, set point and/or error
  • Set minimum and maximum scaling values
  • Use the tieback as the feedforward input
  • Take the square root of the feedforward input
  • Add a feedforward offset
  • Multiply the feedforward term by a constant
  • Perform lead/lag filtering on the feedforward term
  • Download a feedforward value from the PC processor
  • Cascade the output of loop 1 into the set point of loop 2
  • Decouple the VPID output of loop 1 into the feedforward input of loop 2
Process variable inputs2
ConfigurationDifferential
Range (user selectable)+4 to +20 mA
+1 to +5 V DC 
Digital resolution12-bit binary, 1 part in 4095
Accuracy+-0.1% range at 25°C
Input impedence250 ohms (current)
10 megohms (voltage) 
Common mode rejection ratio70dB DC
Common mode voltage range+-200 V with respect to module common
Common mode input resistance2.5 megohms
Input frequency response-3dB at 1kHz
Maximum allowable input+-30 mA (current)
Digital resolution12-binary, 1 part in 4095
Accuracy +-0.1% of range at 25°C
Input impedence250 ohms (current)
4.7 megohms (voltage) 
Maximum allowable input+-30 mA (current)
25 V ms (voltage) 
Temperature coefficient+-50 ppm/°C
Analog outputs2
ConfigurationSingle ended
Maximum current250 mA
Maximum power3 VA
Backplane or external (digital circuits)    1.2 A at 5 V DC
External (analog circuits)100 mA at +15 V DC
100 mA at -15 V DC
Loop update time100msec, typical
Ambient temperature ratingsOperation 0°C to 60°C
Storage -40°C to 85°C
Part number1771-PDC
PDFs

die Specs

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ManufacturerAllen Bradley
Range typePower Supply
RangePLC-2
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