BusWorks® Model 989EN U
ser’s Manual Modbus TCP/IP Digital I/O & Counters
_________________________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:248-295-0880 Fax:248-624-9234 Email:
10
+
-
+
I
EXT
EXC
RTN
EXC
I/O
(INT PULL-UP)
5.5V MIN
INPUTS ARE TRI-STATED IN THIS EXAMPLE
TANDEM OUTPUT MOSFET IS OFF.
EXCITATION IS REQUIRED (8-28V)
SIMPLIFIED I/O (ONE PORT CHANNEL)
3-WIRE SOURCING PROXIMITY SENSOR
R = EXTERNAL RESISTOR, WHICH MAY BE NEEDED IF DEVICE REQURIES MORE
THAN 2mA TO OPERATE OR INPUTS ARE TRI-STATED
OFF
ON
V
8-28V
OPEN-DRAIN OUTPUTS SHARE RETURN.
RTN
CNT
EXC
EXT
EXC
PIN CAN BE USED AS COUNTER OR DIGITAL I/O LINE
EXCITATION IS REQUIRED. EXTERNAL EXCITATION IS 8V MIN TO 31V MAX.
EVENT COUNTER IS RATED FOR FREQUENCIES 0-150 HZ
FREQUENCY INPUT CONNECTION (DRY CONTACT)
SHIELDED
CABLE
Note
– Counters will auto restore count values from non-volatile memory
after a power loss. This option can be disabled through the webpage or via
Modbus if desired.
+
I
EXT
EXC
RTN
EXC
N.O.
CONTACTS AS SHOWN:
LOGIC "1" = ON = CLOSED
LOGIC "0" = OFF = OPEN
I/O
(INT PULL-UP)
5.5V MIN
TANDEM OUTPUT MOSFET IS OFF.
EXCITATION IS REQUIRED (8-28V)
SIMPLIFIED I/O (ONE PORT CHANNEL)
2-WIRE NAMUR / PROXIMITY SENSOR NORMALLY OPEN
R = EXTERNAL RESISTOR, WHICH MAY BE NEEDED IF DEVICE REQURIES MORE
THAN 2mA TO OPERATE
CONNECTIONS
Digital Inputs
Dry Contact Frequency Input
Connection (989EN-4016
Only)
To accommodate dry-contact
relays, counters are equipped
with programmable debounce.
The debounce time can be set
from 0 to 65535 ms. The
debounce time represents the
amount of time an input must
remain stable to increment the
count.
2-Wire Namur/Proximity
Sensor Connection (989EN-
4016 Only)
To accommodate
Namur/Proximity sensors, the
989EN can source current to
drive the sensor. If the device
requires more than 2mA to
operate, an external pull-up
can be added between
Excitation and the Counter
Channel to ensure proper
current.
