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FP-1001
FieldPoint RS-485 Network Module
Highlights
• Isolated RS-485 interface to host computer or to FP-1000
repeater port
• Simple ASCII protocol is compatible with industry standard
Optomux protocol
• Built-in high efficiency power supply powers I/O modules
• Runs on 11 to 30 VDC power
• -40° to +70° C operation
Overview
The FP-1001 is a network module for the FieldPoint system. It
provides connection to an RS-485 network using a simple ASCII
protocol.
This document provides a quick guide to installing and configuring
the FP-1001 network module. For more detailed information on
using the network module, refer to the FP-1000/1001 user manual.
For information on the ASCII protocol used by the network
module, refer to the FP-1000/1001 programmer reference manual.
DIN Rail Mounting
NOTE: Terminal bases must be connected to the network
module before applying power to the module. Do not connect
or disconnect terminal bases while power is applied to the
network module.
FieldPoint ™ is a trademark of National Instruments Corporation. Product and company names are
trademarks or trade names of their respective companies.
321698A-01
©
Copyright 1997 National Instruments Corp. All rights reserved. July 1997
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The FP-1001 has a simple rail clip for mounting reliably onto a
C
standard 35 mm DIN rail. To install the FP-1001 to the DIN rail,
follow these steps:
1. With a flat bladed screwdriver, open the DIN rail clip to the
unlocked position as shown in Figure 1.
Rail Clip LockedRail Clip Unlocked
Figure 1. DIN Rail Clip
2. Hook the lip on the rear of the FP-1001 onto the top of a 35 mm
DIN rail and press the FP-1001 down onto the DIN rail as
shown in Figure 2.
Local Bus
over
Press
Connector
DIN Rail
Figure 2. Installing the Network Module onto a DIN Rail
3. Slide the FP-1001 to the desired position along the DIN rail.
After the FP-1001 is in position, lock it to the DIN rail by
pushing the rail clip in.
4. Add terminal bases to the DIN rail with their local bus
connectors firmly mated to the FP-1001 local bus connector.
The FP-1001 is shipped with a protective cover over the local
bus connector. Remove this protective cover, and place it over
the local bus connector of the last terminal base in the stack as
shown in Figure 3.
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Local Bus Connectors
Firmly Mated
Protective
Cover
Rail Snap
Locked
Figure 3. Installed Network Module
DIN
Rail
Network Connection
Connect the FP-1001 to a host computer, or to the RS-485 repeater
port of an FP-1000, using the 5 position Combicon screw terminal
adapter of the RS-485 connector on the FP-1001. You may connect
up to 25 FP-1001 network modules to a single RS-485 port of a
host computer, or up to 24 FP-1001 network modules to the
RS-485 repeater port of an FP-1000. The pinout of the RS-485
connector is shown in Figure 4.
RX–
RX+
12345
Figure 4. RS-485 Connector Pinout
The TX+ of the host port (or FP-1000 RS-485 repeater port) must
be connected to the RX+ of all of the FP-1001 modules, and the
TX- of the host port (or FP-1000 RS-485 repeater port) must be
connected to the RX- of all of the FP-1001 modules. This pair of
connections provides communication from the host computer to
the FP-1001 modules.
GND
TX–
TX+
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The RX+ of the host port (or FP-1000 RS-485 repeater port) must
be connected to the TX+ of all of the FP-1001 modules, and the
RX- of the host port (or FP-1000 RS-485 repeater port) must be
connected to the TX- of all of the FP-1001 modules. This pair of
connections provides communication to the host computer from
the FP-1001 modules.
These connections are shown in Figure 5.
FP-1001 FP-1001 FP-1001
RX TX RX TX RX TX
120Ω
120Ω
Connect the TX outputs of the host computer to the RX inputs of the FP-1001,
and the RX inputs of the host computer to the TX outputs of the FP-1001.
Figure 5. Typical Signal Connections with One FP-1001 Connected to
Multiple FP-1001 Network Modules
+
To Host
Computer's RS-485
120Ω
–
Receive Input Pair (RX)
–
From Host
Computer's RS-485
120Ω
+
Transmit Output Pair (TX)
Figure 5 also shows the use of 120 Ohm termination resistors. An
RS-485 network must be terminated at each end of the network, but
not anywhere else. Termination resistors should be installed
between the RX pair and between the TX pair of the host RS-485
port and on the RS-485 port of the last FP-1001 on the network. A
pair of terminating resistors are provided with the network
modules. To install them, twist the resistor leads with the RS-485
signal wires and insert them into the RS-485 port terminals.
An RS-485 network also needs biasing resistors to protect the
devices on the network against noise during intervals when no
RS-485 drivers are transmitting on the network. The host
computer’s RS-485 interface normally has provisions for such
biasing resistors. You should use this biasing feature for better
reliability and noise immunity.
Setting the Address and Baud Rate
Figure 6 shows the 8-position switch on the FP-1001 network
module. Switches 1-5 set the network address, and switches 6-8 set
the baud rate. Every network module connected to one serial port
of the host computer must be given a unique address; however,
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modules on different serial ports may have the same address. Every
module on one serial port of a host computer must have the same
baud rate.
Baud
Rate
Address
12345678
12345678
Switch Cover
(Removed)
Figure 6. Address and Baud Rate Switch
Switches 1-5 set the network address of the FP-1001. The
addresses of the terminal bases connected to the network module
are automatically configured to be sequentially higher than the
network module’s address. For example, if the network module is
set to address 20, the I/O module in the terminal base immediately
connected the network module is at address 21, the next I/O
module is at address 22, and so on. A terminal base is assigned a
network address whether an I/O module is inserted into it or not.
Table 1 shows the possible switch positions and the corresponding
address of the FP-1001.
Table 1. Network Address Switch Settings
Switch
Positions 1-5
1234 5678
1234 5678
Network Module
Address (Decimal)
0 130
10 140
Switch
Positions 1-5
1234 5678
1234 5678
Network Module
Address (Decimal)
1234 5678
1234 5678
20 150
30 160
1234 5678
1234 5678
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Table 1. Network Address Switch Settings (Continued)
Switch
Positions 1-5
Network Module
Address (Decimal)
Switch
Positions 1-5
Network Module
Address (Decimal)
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
40 170
50 180
60 190
70 200
80 210
90 220
100 230
110 240
120 Other Settings Not Allowed
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
1234 5678
Switches 6-8 set the baud rate of the FP-1001. Table 2 shows the
switch positions and the corresponding network baud rates.
Table 2. Baud Rate Switch Settings
Switch
Positions 6-8
Network Module
Baud Rate
Switch
Positions 6-8
Network Module
Baud Rate
1234 5678
1234 5678
1234 5678
1234 5678
300 19200
1200 38400
2400 57600
9600 115200
1234 5678
1234 5678
1234 5678
1234 5678
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Powering the FP-1001
NOTE: Terminal bases must be connected to the FP-1001,
and the baud rate switch must be set, before power is applied to
the FP-1001.
An 11-30 VDC power supply is required by each FieldPoint stack.
The network module filters and regulates this supplied power and
provides power for all the I/O modules in the stack. Therefore you
need not provide power separately to each FieldPoint I/O module
in the stack. If your field I/O device needs to be powered
separately, you can use the terminals provided on each terminal
base for such power supply connections.
The power connector is a 4-pin screw terminal connector whose
pinout is shown in Figure 7.
VV
V
11-30 VDC
+
–
CC
To Adjacent Terminal Base
(Optional Connection)
C
Figure 7.
FP-1000 and FP-1001 Power Connector Pinout
The two terminals labeled V are internally connected on the
network module, as are the two terminals labeled C. Power must be
applied to one V and C pair for operation of the FieldPoint system.
If you want to power your field I/O devices from the same power
supply, the second V and C pair provides a convenient means of
connecting power to the V and C terminals of a terminal base.
Figure 7 shows this optional connection.
Specifications
Network ports ...................................1 RS-485 port
Baud Rates........................................300, 1200, 2400, 9600,
Communication parameters..............1 start bit, 8 data bits,
19200, 38400, 57600,
115200 (switch selectable)
1 stop bit, No parity
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RS-485 isolation ...............................2500 Vrms breakdown,
250 Vrms operational
*
∑
Power Consumption..........................1 W + 1.15
power requirements
(I/O module
)
Operating Temperature.....................-40 °C to +70 °C
Storage Temperature.........................-55 °C to + 100 °C
Relative Humidity.............................5% to 90% non-condensing
Weight...............................................240 g (8.4 oz.)
CE Mark Compliance
This product meets applicable EU directive(s) as follows:
Safety isolation ................................ EN 61010 (double insulation
for 250 Vrms working
isolation, installation
category II)
EMC Directive
Immunity.................................... EN 50082-1:1994
Emissions ..................................EN 55011:1991 Group I
Class A at 10 meters
Mechanical Dimensions
Figure 8 shows the mechanical dimensions of the FP-1001.
4.19 [106.4]
4.31
[109.5]
3.58 [90.9]
Figure 8.
Mechanical Dimensions
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