Sensoray 2600 - Manual (Page 43)

2600 Family Instruction Manual 38 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