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:
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Output Over-Temperature Protection:
The outputs have internal over-
temperature limits that trigger for a junction temperature of 165°C
(155°C to 180°C range). Only the output experiencing an over-
temperature condition will shut-down. Upon return to normal
temperature (a 10°C typical hysteresis applies, 5-20°C range), the
output will automatically resume its prior setting, or remain OFF
according to the control bit settings in the Port Output Global
Shutdown/Retry Register.
Output Open-Load Detection (w/Inputs Tri-Stated):
Outputs may utilize
~50uA current sink pull-downs to facilitate open load detection when the
tandem inputs are tri-stated. These are also useful to help keep the
tandem tri-stated input from floating (but note that they pull to the ON
state). This protection is disabled by default and would not be
appropriate where 50uA of OFF state current cannot be tolerated,
where pulling to the ON-state is not appropriate, or if the tandem inputs
are not tri-stated (as tri-stating the inputs turns OFF the opposing
wetting current pull-ups that are also built-in).
Output Refresh Cycle:
Output states automatically refreshed every 5
seconds if not rewritten. This is done to help ensure that outputs
recover their programmed state if EMI or ESD ever causes an
inadvertent state change without resetting the system. By default, this
is turned OFF and it is recommended to be turned OFF to improve
counter performance if you are using counters. Turning output refresh
OFF allows outputs that experience a fault to stay off after the fault is
removed, rather than retry their control (see Global Shutdown and Retry
Control Register).
Counter Alarm Output
– Upon counter rollover condition, an alarm can
optionally be triggered. The output will toggle its state, and reset either
upon next event count (momentary alarm), or from a manual reset
(latched alarm).
Excitation (External):
External voltage is required between EXC and RTN
terminals from 8
– 28V (31V MAX).
Dimensions:
1.05 inches wide, 4.68 inches tall, 4.35 inches deep. Refer to
the dimensions drawing at the front of this manual.
DIN Rail Mount:
Type EN50022; “T” rail (35mm).
I/O Connectors:
Removable plug-in type terminal blocks rated for
15A/300V; AWG #12-24 stranded or solid copper wire.
Network Connector:
8-pin RJ-45 connector socket with metal shield
(shield is isolated and bypassed to earth ground at the GND terminal
with an isolation TVS and capacitor). Connections are wired MDI or
MDI-X. A CAT-5 cable is recommended to connect this module to a
PC.
RJ-45
Signal (MDI)
Description
1
Tx+
Transmit Positive
2
Tx-
Transmit Negative
3
Rx+
Receive Positive
4
Not Used
Connects to Pin 5
5
Not Used
Connects to Pin 4
6
Rx-
Receive Negative
7
Not Used
Connects to Pin 8
8
Not Used
Connects to Pin 7
SPECIFICATIONS
Do not enable open-load
detection without tri-stating the
inputs, as this adds a pull-
down to the I/O channel that
opposes the pull-up present
outside of tri-state mode.
It is recommended to turn
output refresh OFF to improve
counter performance, or if you
wish outputs to remain OFF
following a shutdown due to a
fault condition.
General Specifications
Enclosure and Physical
