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:
56
These DIN-rail mount, industrial Ethernet, digital I/O modules include sixteen
combination digital I/O / counter inputs (989EN), and provide an isolated
10/100BaseT/TX Ethernet port for monitoring and control. Units are DC-
powered and include reverse polarity protection. Outputs are open-drain,
low-side switches, while inputs are active-low. Channel I/O, network, and
power circuits are isolated. Outputs have high voltage/current capacity for
discrete on/off control of external devices. Non-inverting, buffered inputs
provide support for digital level sensing, or for simply reading back the
tandem output. I/O channels share common. The first eight inputs may
function as 32-bit event counters (up to 150 Hz) with programmable
debounce and non-volatile count. Non-volatile reprogrammable memory in
the module stores configuration information.
The BusWorks model prefix “900” denotes the Series 900 network I/O
family. The
“EN” suffix denotes EtherNet. The four digit suffix of this model
number represents the following options, respectively: “4” = Modbus; “0” =
Industrial Model;
“C” = Commercial Model; “16” = 16 Channels.
The 989EN models include 16, active-low, buffered inputs. Inputs are
connected in tandem with the open-drains of output mosfets (see below).
Eight inputs also function as 32-bit event counters (up to 150 Hz) with
programmable debounce. Inputs also include transient voltage suppression
and are intended for DC voltage applications only. An external excitation
supply connection between EXC and RTN (Return) is required for I/O
operation. Inputs include programmable wetting current pull-ups for sensing
switch closure (see below), and inputs may be optionally tri-stated (disables
wetting current). The wetting current generators also allow the tandem
open-drain output to operate without adding a pull-up. Integrated wetting
current helps facilitate an I/O self-test without actual wiring.
IMPORTANT:
Inputs (and outputs) will not operate without port excitation.
External port excitation of 8-31V is required (40mA minimum).
Input Signal Voltage Range:
0 to 31V maximum. Input operating range is
first limited by the I/O transient protection (31V), then the input circuitry
itself (38V), then the tandem output mosfet drain-source voltage (50V).
Input Signal Threshold:
Voltage signals below 4.0V DC (3.7 to 4.3V
range) are ON. Voltages above 4V (3.7 to 4.3V range) are OFF.
Input Event Counters:
Events are counted in 32-bit registers and optionally
stored in non-volatile memory. Event counters are rated from 0-150 Hz.
Additionally the counters are equipped with programmable debounce
(0-65535ms), output alarms, selectable count edge, and up/down
counting.
(Note: Only available on 989EN-4016 model)
Input Counter Debounce:
Event counters can each be enabled to
debounce an input for a specific period of time. Debounce time can be
set from 0 to 65535ms and applied to all counters with debounce
enabled.
Input Counter Direction:
Each event counter can set the count direction to
either up counting (default), or down counting from a pre-load value.
Input Counter Edge:
Each counter can be set to detect the incoming pulse
on the rising edge or falling edge (default),.
Input Counter Pre-Load Value:
Each Input Counter has an associated
Pre-Load Value to start counting from. After a roll-over / reset, the
counter will default back to this value.
Input Pulse Time:
Each Input Counter is equipped with a timer which will
display the time (in milliseconds) between pulses.
SPECIFICATIONS
Model Numbers
989EN-4016
989EN-4C16
Digital Inputs
CAUTION: Failure to pull the
I/O channel above the 4.3V
maximum threshold when the
output is OFF, or with the input
tri-stated, can result in the
OFF output state being
erroneously indicated as ON.
Likewise, attempting to drive
output loads with IR exceeding
4V will cause the input to
indicate an OFF state with the
mosfet ON, as the input
threshold crosses back above
4V (there is up to 16mA of
wetting current per channel).
IMPORTANT:
Inputs and
Outputs will not operate
without excitation.
Note: Excitation of 8V or
greater is required to deliver
the full 2mA/16mA of wetting
current.
Note: Input Counters are only
available on the 989EN-4016
model ONLY.
