BusWorks® 961/962EN User’s Manual Modbus TCP/IP Differential I/V Input
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Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:
http://www.acromag.com
34
Notes (Memory Map):
1. Input values are 16-bit signed integer values representing percent with a
resolution of 0.005%/lsb.
±
20000 is used to represent
±
100%. The full
range is –163.84% (-32768 decimal) to +163.835% (+32767 decimal).
For example, -100%, 0% and +100% are represented by decimal values
–20000, 0, and +20000, respectively. Bipolar voltage ranges (961EN)
use
±
100% (span of –20000 to +20000), current ranges (962EN) use 0-
100% (span of 0 to 20000).
2. The
962EN A/D Count value is calculated via the expression: count =
(32768*Vin*Gain/Vref)+32768, where Vref=1.235V. Gain is 1 (
±
10V
range), 2 (
±
5V), 4 (
±
2.5V), 8 (
±
1.25V), 16 (
±
625mV), 32 (
±
313mV), 64
(
±
156mV), and 128 (
±
78mV).
The 961EN A/D Count value is calculated via the expression: count =
(32768*Iin*24.9
Ω
*Gain/Vref)+32768, where Vref=1.235V. Gain is 2 (0-
20mA & 4-20mA range), 4 (0-11.17mA range), or 32 (0-1mA range).
These DIN-rail mount, industrial Ethernet, analog input modules will
condition up to six differential DC current (961EN), or voltage (962EN) input
signals, and provide an isolated 10/100BaseT Ethernet port for monitoring
and control. Units are DC-powered and include reverse polarity protection.
Analog inputs (as a group), network, and power are isolated from each
other. Non-volatile reprogrammable memory in the module stores
configuration and calibration information.
The BusWorks model prefix “900” denotes the Series 900 network I/O
family. The “EN” suffix denotes EtherNet. Select 961EN for current input,
and 962EN for voltage input. The four digit suffix of this model number
represents the following options, respectively: “4” = Ethernet; “0” = Default;
“06” = 6 Channels.
Up to six process current or voltage input channels, according to model
number. The unit can be configured to accept one of several input ranges at
each group of 3 channels as described below. The unit must be wired and
configured for the intended input type and range (see Connections section
for details). The following paragraphs summarize this model’s input types,
ranges, and applicable specifications.
DC Current (961EN Only):
Configurable for 0 to 20mA, 4-20mA,
0-11.17mA, and 0-1mA DC nominal input ranges. A precision 24.9
Ω
current sink resistor converts the input current to a voltage that is
processed by the A/D converter. An optional external sensor is
required to monitor AC current signals (Acromag Model 5020-350).
This sensor generates a DC milliampere signal of 0 to 11.17mA for the
module (see Table 1 below for scaling to AC current).
Current Input Reference Test Conditions:
4 to 20mA current input;
ambient temperature = 25
°
C; 24VDC supply.
Input Overvoltage Protection:
Bipolar Transient Voltage Suppressers
(TVS), 5.2V clamp level typical.
Register Map
Model 961EN-4006
Model 962EN-4006
SPECIFICATIONS
Model Numbers
961EN-4006 (6 DC Current)
962EN-4006 (6 DC Voltage)
Analog Inputs
