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2600 Family Instruction Manual

Chapter 7 : Model 2610 Digital I/O Module

Except for J24 and J48 (channels 46 and 47), each jack exposes

connections to three DIO channels. For example, J1 provides

connections to channels 0, 1 and 2. This feature can simplify

wiring in cases where a single field cable must carry more than

one DIO signal.

To get an idea of how this feature might be used, consider the

case of a three-lamp lintern assembly with integrated cable

(Figure 36). The source end of the cable can terminate to a

single jack on the DIO module, which in turn provides access

to all three lamp control signals.

Figure 36: Multiple Channels on Each I/O Jack

7.2.4.1 Restrictions

There are a few restrictions related to connecting multiple DIO

channels through a single RJ-12 jack:

1. When multiple DIO channels connect to field wiring

through a single jack, the channels that share the jack need

not be powered from the same power source, but only one

power source per jack is available to the field wiring.

An example of this can be seen in Figure 36, in which all

three lamps are powered from a common PWR source;

this would not be possible if the lamps required differing

supply voltages, because only one supply voltage is

available from the jack.

2. If power can be interrupted on a DIO channel, the channel

must connect to field wiring through a dedicated jack that

is not shared by any other channels.

For example, suppose PWR3 may be interrupted by an

interlock contact, and channel 42 is powered from PWR3.

In this case, the jack that connects field wiring to channel

42 (e.g., J21, J22 or J40) may connect to CH42, GND and

PWR, but it must not make field wiring connections to any

other DIO channels.

7.3 Channel Operating Modes

Each channel may be independently operated as an input or a

programmed, standard output.

7.3.1 Input Operation

To use a channel as an input, the client must ensure that it

never programs the channel to its active state. Since the client

never enables the channel’s output driver, the channel may be

driven by an external, active-low driver. When the external

driver is not driving the channel low, the channel’s pull-up

resistor will force the channel to its inactive state.

7.3.2 Standard Output Operation

When a channel is used as a standard output, the client simply

programs the channel’s output driver to the desired state. The

channel is either driven low by the channel’s on-board driver,

or it is pulled high by the channel’s pull-up resistor.

7.3.3 Wired-or Operation

Since a DIO channel’s output driver is open-collector, it is

possible to “wire-or” a channel by operating it both as a

programmed output and by connecting the channel to one or

more external open-collector drivers. If any of the connected

drivers asserts its active-low output, the channel will be driven

to its active state.

7.3.4 Output Modes

DIO channels 0 to 23 are unique in that they support two

different output modes: Standard and PWM. In the Standard

mode, a channel may be driven as described earlier: either by

its explicitly programmed onboard driver or by an external

current sink. In the PWM mode, the channel’s output driver is

cycled on and off at a client-specified duty cycle.

The output mode may be independently configured for each

channel. For example, channel 0 can operate in the PWM

mode while channels 1 to 23 operate in the Standard output

mode.

All channels support the Standard operating mode, which is the

default mode following a reset. Only channels 0 through 31

may be configured for the PWM mode; channels 32 through 47

support only the Standard mode.

CH37 J43 NC PWR CH37 CH38 CH39 GND

CH38 J20 NC PWR CH38 CH39 CH40 GND

CH39 J44 NC PWR CH39 CH40 CH41 GND

CH40 J21 NC PWR CH40 CH41 CH42 GND

CH41 J45 NC PWR CH41 CH42 CH43 GND

CH42 J22 NC PWR CH42 CH43 CH44 GND

CH43 J46 NC PWR CH43 CH44 CH45 GND

CH44 J23 NC PWR CH44 CH45 CH46 GND

CH45 J47 NC PWR CH45 CH46 CH47 GND

CH46 J24 NC PWR CH46 CH47 NC GND

CH47 J48 NC PWR CH47 NC NC GND

Table 18: Pinouts of the I/O Connectors

PWB

Label

RJ-12

Jack

Pin Signal

1 2 3 4 5 6

1:NC

2:PWR

3:CHx

4:CHx+1

5:CHx+2

6:GND

RJ-12 Jack

on 2610

PWR+

PWR-

Yellow

PWR+

PWR-

Green

PWR+

PWR-

Red

Lamp Column

Field

Wiring

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 79 80

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