Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 207
May 2019
11. Analog Calibration
11.1. Overview
All calibration data for Analog Input Modules and Analog Output Modules is stored in non-volatile
memory in the I/O modules. Calibration data is stored for each channel of each AI or AO module.
Calibration data for each channel can be either:
Factory calibration, which is stored permanently in the module, and
Field Calibration, which is entered from an HMI (OI- on the galvanically isolated RS-485 Port,
and/or a PC on the RS-232 Port and/or the Ethernet 10/100 Base-T Port using Designer
Software.
A field calibration procedure consists of two parts:
Connecting a calibration device to each channel of an AI or AO module, and
Using the Control Station, HC Designer, or HC Utilities to select actions and enter custom
calibration data values calibration into the I/O module.
This section contains information and instructions for connecting calibration devices.
Hazardous voltages exist at the Power Supply and at the terminal boards on I/O
Modules
Only trained and authorized personnel should perform the procedures in this section.
Failure to comply could result in death or serious injury.
Analog Input Calibration
Analog input modules can accommodate five input types:
RTD*
Thermocouple*
Ohms*
Volt
millivolt*
4-20 mA
*Not available on high level analog input modules.
Calibration values for each channel are stored in the module as numeric values paired with A/D
conversion counts corresponding to those numeric values. The numeric values are those identified as
‘REFERENCE’ on the OI or HCD calibration displays; apply these values to the input terminals during
the calibration procedure.
For AI channels configured as thermocouple inputs, the stored calibration values are compensated by the
measured temperature of the terminals. Because of this observe the following rules:
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