National Instruments FP-TB-10 User Manual

OPERATING INSTRUCTIONS

FP-TB-10

Terminal Base and Dual-channel FieldPoint Modules

These operating instructions describe the installation, features, and characteristics of the FP-TB-10 and the various dual-channel modules. For details on configuring and accessing these modules over a network, refer to the user manual for the particular FieldPoint network module you are using with the dual-channel system.

Features

The FP-TB-10 terminal base and the dual-channel FieldPoint modules have the following features:

• High granularity of system design with up to six dual-channel I/O modules per terminal base.

• Any combination of I/O types in each terminal base.

• Each dual-channel I/O module is independently isolated.

FieldPoint dual-channel modules include a family of two-channel I/O modules for maximum flexibility in configuring I/O systems. You can mount up to six dual-channel modules in any combination on the FP-TB-10 terminal base. You can mix dual-channel modules with standard eight- and 16-channel modules in a single FieldPoint bank. Therefore, you can configure your FieldPoint system to match your specific I/O needs very closely, minimizing the size and cost of your distributed I/O system. In addition, the dual-channel modules provide a flexible solution for applications requiring channel-to-channel isolation.

FieldPoint™, National Instruments™, and ni.com™ are trademarks of National Instruments Corporation. Product and company names m entioned herein are trademarks or trade names of their respective comp anies.

DIN Rail Mounting

Before connecting a terminal base to a network

Note

module, the network module must be powered off.

1. With a flat-bladed screwdriver, open the rail clip to the unlocked position as shown in the following figure.

2. Hook the lip on the rear of the terminal base onto the top of a 35 mm DIN rail and rotate the terminal base down onto the DIN rail as shown in the following figure.

Press onto rail

and snap into place

DIN Rail

3. Slide the terminal base along the DIN rail until its local bus connector mates with the connector of the terminal base or network module adjacent to it.

4. Lock the terminal base to the DIN rail by pushing in the rail clip.

5. Continue adding as many terminal bases as you need to the DIN rail, making sure to mate the local bus connectors.

6. Place the protective cover over the local bus connector of the last terminal base in the stack. The following figure shows an installed terminal base.

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Local Bus Connectors

Firmly Mated

Protective Cover

Rail Clip

Locked

DIN Rail

Panel Mounting

1. With a flat-bladed screwdriver, open the rail clip to the unlocked position.

2. Snap the panel mount accessory onto the terminal base as shown in the following figure.

Press

3. Lock the rail clip.

4. Mount the FP-TB-10 and panel mount accessory onto the desired surface. You can drill pilot holes using the directions in the panel mount adapter installation guide.

You should install the network module first, using two bolts/screws, then install the FP-TB-10 module(s) using the right bolt tab. If you use a FieldPoint bus extender cable, the first FP-TB-10 on the new row should use both panel mount bolt tabs.

Installation

You can install up to six dual-channel modules on each FP-TB-10 terminal base. You can use any combination of modules in any order on the terminal base.

To install a dual-channel module on an FP-TB-10, snap the module onto the terminal base while squeezing the legs of the module inwards. Install the modules with the colored label oriented towards the top. Make sure that both legs of the module are securely snapped into place.

Terminal Base

I/O Module

To remove a dual-channel module, squeeze the legs of the module together to unlock, then pull from the terminal base.

Hot Plug-and-Play Live Insertion and Swapping of Modules

You can install modules while the network module is powered and in operation. Replacing any dual-channel module with another dual-channel module of the same type will not interrupt the FieldPoint system’s operation (although during the time a module is missing, it will be reported as having a bad status). The new dual-channel module will be automatically configured with the same settings as the previous module, and if it is an output module, the output value will be automatically updated. However, if a module of a different type replaces a removed dual-channel module, the FP-TB-10 will reset itself and all six of its modules and will request new initial configuration settings from the network module.

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Field Wiring

The terminal base has four screw terminal connections for each of the six dual-channel modules. These four connections are labeled “1a” and “1b” for channel 1, and “2a” and “2b” for channel 2. The signal connections for each of the different I/O modules are listed in these instructions and are also printed on the sides of each of the I/O modules. In addition to these terminals are six pairs of terminals labeled V and C. These V and C terminals are not directly connected to the dual-channel modules, but all of the V terminals are connected together and all of the C terminals are connected together. These terminals may be useful for connecting terminals of the dual-channel modules to external power supply voltages, or for bussing power to your field devices. You do not need to connect anything to these V and C terminals for proper operation of the dual-channel modules.

Some dual-channel modules may provide for other field wiring connection means on the modules, as opposed to using the screw terminal connections of the FP-TB-10. These include the thermocouple modules and the four-wire RTD module.

Update Rates

The FP-TB-10 continuously scans through its six dual-channel modules, updating outputs and reading inputs. The rate of this scan varies depending on the modules in the FP-TB-10. Empty modules and digital modules add 0.2 ms each to the scan time, while analog modules add 1.5 ms each. The sum of these six times is the total scan time. Each I/O module makes its data available to or reads its data from the network module once per scan time. However, the network module makes data available to and receives data from the network at rates that are independent from the operation of the FP-TB-10 and the dual-channel modules. Refer to you network module user manual for more details on the operation and throughput of your particular network.

Power Requirement (P+)

The FP-TB-10 and the dual-channel modules are powered through the local backplane bus from the FieldPoint network module. An FP-TB-10 with I/O modules may require more than the nominal power allocated to an I/O module from the network module. In some applications, this could limit the number of I/O modules that you can connect to a single network module. When defining a FieldPoint system that uses an FP-TB-10, you must calculate the total power consumption of the FP-TB-10 with its dual-channel modules, as well as the power consumption of the other I/O modules in the system. The total power consumption of all these modules must be less than 9 Watts. The FP-TB-10 alone requires

0.15 Watts of power; add to this the individual power requirements

of the dual-channel modules given in the specifications section.

For example, an FP-TB-10 with three FP-AO-C020 dual-channel modules and two FP-AI-C020 dual-channel modules requires

4.2 Watts of power (0.15 W + 3 × 1.1 W + 2 × 0.375 W). A bank

of FieldPoint modules including two such FP-TB-10 bases uses

8.4 Watts of power—nearly the entire 9 Watt limit.

Dual-Channel I/O Modules

This section describes the features of the individual dual-channel I/O modules.

Analog Current Input Modules (FP-AI-C020 and FP-AI-C420)

The FP-AI-C020 and the FP-AI-C420 are current input modules. They provide 12-bit resolution measurements. Each channel has a programmable filter with two settings, 20 Hz bandwidth or 100 Hz bandwidth. Each module has two channels with a 133 Ω input impedance that share a common reference point (the “b” terminals). For applications requiring channel-to-channel isolation, you can use only one channel of each module. Field devices should be wired such that current flows into the “a” terminals and returns out through the “b” terminals. The following figure shows an example of this wiring. You may choose to use the V and C terminals to conveniently connect loop power supplies for your current transmitters.

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