Nexus 1250 - Analog Input Modules

Doc# E107706 9- 10
Electro Industries/GaugeTech
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9: External I/O Modules
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 Nexus® 1250/1252 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 EIG’s PSIO.
All inputs share a single common point. This is also an isolated connection (from
ground).
Table 2:
Analog Input Module Specifications
Model Numbers 8AI1: 8-channel analog input 0±1mA
8AI2: 8-channel analog input 0±20mA
8AI3: 8-channel analog input 0±5VDC
8AI4: 8-channel analog input 0±10VDC
Accuracy 0.25% of Full Scale
Scaling Programmable
Communication RS485, Modbus RTU
Programmable Baud Rates: 4800, 9600, 19200,
38400, 57600
Power Requirement 12-20VDC @50-200mA; 1250/1252 supports 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 Address: 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