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2600 Family Instruction Manual

Chapter 6 : Model 2608 Analog I/O Module

“AOUT7,” which correspond to analog output channels 0

through 7, respectively.

The connector pinout is identical for all eight AOUT channels:

6.4.2 Analog Inputs

Each AIN channel is provided with a 10-pin header—called

the input programming block, or IPB—that is designed to

accept hardware programming shunts. Various signal

conditioning options are enabled by installing shunts on the

IPB as described in the following sections.

6.4.2.1 Thermocouple Shunts

Each IPB has options for installing either one or two shunts for

TC support. A shunt should always be installed at pins 5-6

when the affiliated AIN channel will be connected to a TC.

This will prevent the TC’s common-mode voltage (CMV)

from exceeding the maximum specified input CMV for the

AIN channel, and it provides a low impedance current path to

ground for RF noise.

To enable open-TC detection, install a second shunt at pins

7-8. This will force the AIN channel to return a large, positive

digitized value in the event of an open-circuit failure at the

TC’s hot junction. If this shunt is not installed, the returned

digitized value will be indeterminate in the case of an open TC.

6.4.2.2 4-20mA Termination Shunts

When an AIN channel is interfaced to a 4-20mA current loop,

the IPB may be programmed to insert a 500 ohm, 1% resistor

into the loop to convert the loop current to a voltage. Install a

shunt at pins 9-10 to enable this option.

6.4.2.3 Power Distribution Shunts

In many applications, it is necessary to supply operating power

to devices that are connected to AIN channels. The IPB may

be programmed to route either 24VDC or 10VDC to an

external device via the associated AIN channel’s terminal

block. The selected voltage is routed to the channel’s “Pwr”

terminal.

Install a shunt on the IPB at pins 3-4 to route 24VDC to the

Pwr terminal. Install a shunt on the IPB at pins 2-4 to route

10VDC to the Pwr terminal.

6.4.2.4 Terminal Blocks

Eight 10-pin pluggable terminal blocks (TBs) provide all

connections required by the sixteen AIN channels. Each TB

provides connections for two adjacent AIN channels, as shown

in Table 12.

Each AIN channel has five signals, as detailed in Table 13.

Table 10: AOUT Connectors

Chan Connector

AOUT0 P1

AOUT1 P2

AOUT2 P7

AOUT3 P8

AOUT4 P9

AOUT5 P10

AOUT6 P15

AOUT7 P16

Table 11: Pinouts of AOUT Connectors

Layout

(top view)

Pin Name Function

1 Shld This may be connected to a cable shield,

but the shield conductor must be left

disconnected at the remote end of the

cable in order to avoid ground loops.

2 Out Analog output signal that supplies current

to the load.

3 Sense Analog output remote sense.

4 Com Analog output current return. The load is

connected between this pin and Out.

5 Pwr Optional power output, either 24VDC or

10VDC.

123

456

Table 12: Pinouts of AIN Terminal Blocks

Layout

(top view)

Pin No.

Func.

Channel

Pwr

1 3 5 7 9 11 13 15

Shld

Ain+

Ain-

Com

Pwr

0 2 4 6 8 10 12 14

Shld

Ain+

Ain-

Com

TB: P6 P5 P4 P3 P11 P12 P13 P14

Table 13: AIN Signals

Name Function

Pwr Optional power output, either 24VDC or 10VDC.

Shld This may be connected to a cable shield, but the shield conductor

must be left disconnected at the remote end of the cable in order to

avoid ground loops.

Ain+ Positive sense input. The differential input signal is applied to

Ain+ and Ain-.

Ain- Negative sense input.

Com Analog ground reference. If connecting to an isolated signal

source (e.g., isolated power supply, battery, etc.) this should be

connected to Ain+ or Ain- to prevent excessive common mode

voltages. This signal may also be used as a current return for Pwr.

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