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:
62
Modbus TCP/IP Protocol Support:
Up to 5 sockets may be selected.
Web pages for configuration and control are built-in and may be
accessed over Ethernet via a standard web browser. Most module
functionality is configured via memory map registers or web pages, but
some functionality may only be configured via web pages.
Communication Distance:
The distance between two devices on an
Ethernet network is generally limited to 100 meters using recommended
copper cable. Distances may be extended using hubs, switches, or
fiber optic transmission. However, the total round trip delay time must
not exceed 512 bit times for collision detection to work properly.
Address:
The module IP address can be preset by the user (static) and
loaded from internal non-volatile memory, or it can be automatically
acquired at startup via a network server using a DHCP (Dynamic Host
Configuration Protocol). The unit also includes a default mode toggle
switch to cause the module to assume a “known” fixed static IP address
of 128.1.1.100 for troubleshooting purposes.
LED Indicators:
RUN (Green) -
Constant ON if power is on and unit is OK. Continuous
flashing ON/OFF indicates unit is in “wink” ID mode.
ST (Orange)
–
Slowly blinks ON/OFF in default mode, blinks rapidly if a
watchdog timeout has occurred, and stays solid for counter alarm
state.
LINK (Green)
–
Indicates Ethernet link status (ON if auto-negotiation has
successfully established a connection
ACT (Orange)
– Indicates current activity on the Ethernet port (ON if data
is being transmitted or received).
Controls:
Default Address Switch:
This momentary push-button switch is located
on the front panel and is used to toggle the module into, or out of
Default Communication Mode. In Default Mode, the module assumes
the fixed static IP address “128.1.1.100”, a default subnet mask
“255.255.255.0”, a default username of “User”, and a default
password of “password”. This switch can also be used to restore the
module to its initial factory configuration by holding this switch in its
default position while powering up the unit (see “Getting Out Of
Trouble” in the Troubleshooting section for more information).
The minimum cable required for full operation of this device is Category 5.
The term “Category” refers to classifications of UTP (Unshielded Twisted
Pair) cables. There are 3 main categories of cable
– Category 3, Category
4, and Category 5. The differences in classification are found in their
electrical performance and this is documented in the TIA/EIA 568A standard.
Category 5 cable includes four twisted wire pairs at eight twists per foot.
This device is designed for use in harsh industrial environments. Acromag
recommends the use of shielded cable when wiring to this device. Select
STP (Shielded Twisted Pair) cable rather than UTP (Unshielded Twisted
Pair). The use of shielded cable will help protect the data being transmitted
from harmful EMI (Electromagnetic Interference) and RFI (Radio Frequency
Interference). It will also help to lower your radiated emissions by keeping
the cable from emitting EMI and RFI.
Refer to Acromag Application
Note 8500-734 for instructions
on how to change the IP
address of your PC network
interface card in order to talk
to an Acromag module.
SPECIFICATIONS
Controls & Indicators
ACCESSORY
CABLES
