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
7
16
16
14
14 13
13
11
11
-
+
TB1
IN
1
-
IN
1
-
IN
0
-
-
IN
0
+
IN
0
+
+
-
+
S
E
N
S
O
R
S
15
15
12
12
-
+
INP
IN
1
+
IN
1
+
INPUTS 0, 1
DCS/PLC
FIELD
XMTR
DIFFERENTIAL
CURRENT MONITORING
OUT
+24V DC
Temperature
Pressure
Level
Flow
Speed
961EN
NOTE: 961EN INPUTS ARE NOT
ISOLATED CHANNEL-TO-CHANNEL,
EXCEPT FOR COMMON MODE
VOLTAGES LESS THAN +/-5V. AS
SUCH, A 4-20mA ISOLATOR MAY BE
REQUIRED FOR CURRENT LOOPS
WITH LOADS GREATER THAN 250 OHMS.
1515
1414
1212
1111
1616
1313
IN1-
IN1-
INP
U
TS
0, 1
TB1
-
+
IN1+
IN1+
IN0-
10V
962EN
IN0+
IN0+
BRIDGE OUTPUTS
DIFFERENTIAL VOLTAGE MONITORING
NOTE: 962EN INPUTS ARE NOT ISOLATED CHANNEL-TO-
CHANNEL, EXCEPT FOR COMMON MODE VOLTAGES
LESS THAN +/-12V. AS SUCH, LIMIT BRIDGE EXCITATION
TO 10V OR LESS.
1515
1414
1212
1111
IN0-
-
+
1616
1313
-
+
IN1-
IN1-
IN
P
U
T
S
0
, 1
S
E
N
S
O
R
S
IN1+
IN1+
-
+ FIELD
XMTR
-
250
OHMS
-
IN0+
IN0+
INP
+
+
DCS/PLC
TB1
DIFFERENTIAL
VOLTAGE MONITORING
Temperature
Pressure
Level
Flow
Speed
CHART RECORDER
DATA LOGGER
OR TRANSMITTER
962EN
+24V DC
250 OHMS
OUT
NOTE: 962EN INPUTS ARE NOT
ISOLATED CHANNEL-TO-CHANNEL,
EXCEPT FOR COMMON MODE
VOLTAGES LESS THAN +/-12V. AS
SUCH, A V/V ISOLATOR MAY BE
REQUIRED FOR USE WITH LOOP
LOADS GREATER THAN 500 OHMS.
9
Connect Earth Ground as shown in the connection drawings above.
Additionally, connect the GND terminal (TB3-33) to earth ground.
The ground connections noted are recommended for best results. If
sensors are already grounded, use caution and avoid making additional
ground connections which could create ground loops.
The plastic module housing does not require earth ground.
CONNECTIONS
Analog Inputs
Although the 961/962EN are
not isolated channel-to-
channel, they do provide
common mode isolation for
low level voltages in the range
of ±12V (962EN), and ±5V
(961EN). This makes these
models useful for differential
current and voltage monitoring
applications similar to the
examples shown here.
Earth Ground
Warning:
To comply with
safety and performance
standards, use shielded cable
and connect earth ground as
noted. Failure to use good
wiring and grounding practices
may be unsafe and hurt
performance.
