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BusWorks® Model 989EN U
ser’s Manual Modbus TCP/IP Digital I/O & Counters
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Acromag, Inc. Tel:248-295-0880 Fax:248-624-9234 Email:
8
5V
INP
V+
RTN
EXC
5V
RTN
or
+
I/O
(INT PULL-UP)
RTN
TANDEM OUTPUT MOSFET IS OFF.
EXCITATION IS REQUIRED (8-28V).
INP
EXT
EXC
5.5V MIN
IF INPUTS ARE NOT TRI-STATED, EXTERNAL PULLUP IS OPTIONAL.
EXTERNAL 5V LOGIC MUST BE PULLED UP ABOVE 4V INPUT THRESHOLD.
IF INPUTS ARE TRI-STATED, EXTERNAL PULLUP IS REQUIRED.
SIMPLE DIGITAL INPUT CONNECTIONS
I
+
I/O
EXC
(INT PULL-UP)
EXT
EXC
5.5V MIN
RTN
TANDEM OUTPUT MOSFET IS OFF.
N.C.
EXCITATION IS REQUIRED (8-28V)
SIMPLIFIED I/O (ONE PORT CHANNEL)
N.O.
CONTACTS AS SHOWN:
LOGIC "1" = ON = CLOSED
LOGIC "0" = OFF = OPEN
DRY-CONTACT RELAY CONNECTIONS - NORMALLY OPEN OR CLOSED
WETTING CURRENT IS 16mA FOR 20ms AFTER INPUT CROSSES 4V THRESHOLD,
THEN RETURNS TO 2mA CONTINUOUS.
I
+
N.O.
N.C.
RTN
I/O
(INT PULL-UP)
5.5V MIN
EXC
EXT
EXC
EXT PULL-DOWN MAY BE REQUIRED
FOR SOME APPLICATIONS.
OPEN-LOAD CURRENT.
TANDEM OUTPUT MOSFET IS OFF.
PORT INPUTS ARE TRI-STATED TO TURN OFF WETTING CURRENT PULL-UPS
NOTE: IT IS ACCEPTABLE TO UTILIZE THE 24VDC POWER TO THE UNIT TO
DRIVE THE EXCITATION TERMINAL AND/OR THE CONTACT EXCITATION.
DO NOT ALLOW UNUSED TRI-STATED INPUTS TO FLOAT OR TURN ON OUTPUT
AN EXTERNAL PULL-DOWN RESISTOR MAY BE REQURIED FOR SOME APPLICATIONS.
EXCITATION IS REQUIRED (8-28V)
SIMPLIFIED I/O (ONE PORT CHANNEL)
DRY-CONTACT RELAY CONNECTIONS - NORMALLY OPEN
OR CLOSED WITH EXTERNAL SERIES CONTACT EXCITATION
CONTACTS AS SHOWN:
LOGIC "1" = ON = OPEN
LOGIC "0" = OFF = CLOSED
Refer to the examples that follow for other types of input connections.
CONNECTIONS
Digital Inputs
Normally Open (N.O.) or
Normally Closed (N.C.) Dry
Contact Relay.
Inputs use wetting current to
sense external contact state.
This current normally goes to
16mA when the input
descends below the 4V
threshold, for 20ms, then
returns to 2mA continuous.
Normally-Closed Dry Contact
Relay with Series Contact
excitation
Do not exceed 31V at the
inputs.