Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 144)

Chapter 5
5Ć9
NOTE: When the dynamic block containing the calibration bit is first
transferred after power up, the module automatically enters calibration
mode. Place the module in calibration mode as follows:
set W01 B13 by loading C800 hex into word W01
cycle backplane power to the PID module
Module calibration consists of the following seven procedures.
1. Voltage reference
2. A/D offset error and gain error compensation
3. isolation amplifiers
4. output amplifiers, current mode
5. current inputs, +4 to +20mA
6. tieback inputs, +4 to +20mA
7. output amplifiers, voltage mode
Procedures 3 through 7 require the calibration of loop 1 followed by the
calibration of loop 2 before starting the next procedure.
Calibration adjustments should be set to the exact values stated in the text
except where a tolerance is given. Calibration readings should be made to
+0.0002V dc.
Field wiring arm terminals are referred to in the calibration procedures as
TERMINAL followed by a number.
Voltage Reference
Adjust the module’s precision voltage reference to -10.0000V dc using the
following procedure. The programming plugs should be set for voltage
mode as described in section titled Installation
1. Connect the digital voltmeter as follows:
Calibration Procedures