CHAPTER 9: EXTERNAL I/O MODULES ANALOG INPUT MODULES
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 9–11
9.6 Analog Input Modules
9.6.1 Overview
The Analog Input Modules (0 ±1mA, 0 ±20mA, 0 ±5Vdc and 0 ±10Vdc) are available in 8-
channel format. Maximum registers per request, read or write, is 17 registers.
The EPM 9450/9650 meter supplies power for up to 4 connected Analog Input modules.
See Section 9.2 for power and communication details. Refer to Section 5.6.2 to determine if
you must use an additional power source, such as GE’s PSIO.
All inputs share a single common point. This is also an isolated connection (from ground).
The Modbus Map for the Analog Output Module (and operating details) can be found in the
Modbus Communicating I/O Modules Manual.
Ta b l e 0
Analog Input Module Specifications
Model Numbers 8AI1: 8-channel analog input 0 ±1mA
8AI2: 8-channel analog input 4-20mA
8AI3: 8-channel analog input 0 ±5VDC
8AI4: 8-channel analog input 0 ±10VDC
Accuracy 0.1% of Full Scale
Scaling Programmable
Communication RS485, Modbus RTU
Programmable Baud Rates: 4800, 9600, 19200, 38400, 57600
Power Requirement 15-20VDC @50-200mA; EPM 9450/EPM 9650 support up to four
modules
Operating Temperature (-20 to +70)
o
C/(-4 to +158)
o
F
Maximum Load
Impedance
0 ±1mA: 10k Ohms; 4-20mA: 500 Ohms
Factory Settings Modbus Addresses:
8AI1: 136
8AI2: 140
8AI3: 144
8AI4: 148
Baud Rate: 57600
Transmit Delay Time: 0
Default Settings (Reset
Button)
Modbus Address: 247
Baud Rate: 57600
Transmit Delay Time: 20msec
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