Woodward MicroNet TMR 5009, Installation/Hardware Manual

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5009 Installation/Hardware Manual 85580V2
54 Woodward
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SIO-A port 2 (RS-232) functions as an interface port to Woodward’s
servPanel program.
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SIO-A port 3 (RS-232/422/485) functions as Modbus #1 port 1.
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SIO-A port 4 (RS-232/422/485) functions as Modbus #2 port 1 or DDE
communication for PCI.
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SIO-B Port 1 (RS-232) functions as an Alarm/Trip Printer driver port
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SIO-B port 2 (RS-232) functions as an interface port to Woodward’s
servPanel program.
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SIO-B port 3 (RS-232/422/485) functions as Modbus #1 port 2 or DDE
communication for PCI.
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SIO-B port 4 (RS-232/422/485) functions as Modbus #2 port 2.
All communication ports can interface with other devices via RS-232
communication. RS-232 communication is limited to a distance of 15 m (50 ft). In
cases where a device which is being interfaced to is located a distance of greater
than 15 m (50 ft) from the control, it is recommended to use SIO cards. It is
possible also to use RS-232 to RS-422/485 converters. CPU communication
ports are considered less reliable than SIO port. As a consequence, if Modbus
communication is used as a main interface device, it is recommended to use SIO
cards. If Modbus redundant lines are required, it is recommended to use SIO
cards.
RS-422 and RS-485 communication support multidropping (multiple slaves on a
single communication line); RS-232 communication does not.
To allow an RS-232 based port to reach farther than 15 m/50 ft, a Model 285
Superverter from Telebyte Technology Inc. of Greenlawn NY, or equivalent, can
be used as an RS-422 or RS-485 interface converter. RS-422 and RS-485
communications also support multidropping (multiple slaves on a single
communications line); RS-232 communications does not.
Each SIO module includes four serial ports. Ports 1 and 2 are RS-232
communications based ports only. Ports 3 and 4 can be configured for RS-232,
RS-422, or RS-485 communications. With the use of RS-422 or RS-485
communications, the control can interface with a device through serial
communications up to 1219 m (4000 ft) from the control. Alternatively one or two
SIO modules may be installed within the control’s chassis.
Figures 4-16 and 4-17 show the control’s communication port connections. The
5009 control can simultaneously communicate with up to four Modbus based
devices via the CPU-A port, CPU-B port, SIO-A port 3, and SIO-B port 3 using
ASCII or RTU Modbus transmission protocols. Refer to Volume 3 of this manual
for a list of all the Modbus commands and parameters available.
The CPU-C port is dedicated for DDE communications and is intended to be
used as the main interface with the system engineering workstation (PCI
program software loaded onto a computer). Optionally port 4 on any installed
SIO module may also be used for DDE communications. Refer to Volume 3 of
this manual for details on DDE communications and the PCI program. An
RS-232 based null-modem cable (W20) is provided with the system to use when
interfacing between a computer and the control. Upon a failure of the CPU-C port
or kernel-C CPU, the control can be configured to use the CPU-B port as the PCI
interface port.
Three port filter assemblies (one per CPU) are provided with each system to
protect the CPU from external system noise. These filter assemblies are shipped
separately from the control and can be easily installed if use of the CPU port is
required. Refer to Chapter 2 of this volume for installation instructions.