Ross Controls ROSS MODULAR I - Manual (Page 41)

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Digital I/O Modules
Choose digital I/O modules when you need:
• Input Modules. An input module responds to an input
signal in the following manner:
- Input filtering limits the effect of voltage transients
caused by contact bounce and/or electrical noise.
If not filtered, voltage transients could produce
false data. All input modules use input filtering.
- Optical isolation shields logic circuits from possible
damage due to electrical transients.
- Logic circuits process the signal.
- An input LED turns on or off indicating the status
of the corresponding input device.
• Output Modules. An output module controls the
output signal in the following manner:
- Logic circuits determine the output status.
- An output LED indicates the status of the output
signal.
- Optical isolation separates module logic and bus
circuits from field power.
- The output driver turns the corresponding output
on or off.
• Surge Suppression. Most output modules have built-
in surge suppression to reduce the effects of high-
voltage transients. However, we recommend that you
use an additional suppression device if an output is
being used to control inductive devices, such as:
- Relays
- Motor starters
- Solenoids
- Motors
Additional suppression is especially important if your
inductive device is in series with, or parallel to, hard
contacts such as:
- Push buttons
- Selector switches
The digital I/O modules support:
• A wide variety of voltage interface capabilities
• Isolated and non-isolated module types
• Point-level output fault states
• Choice of direct-connect or rack-optimized
communications
• Field-side diagnostics on select modules
Connector types are indicated by the catalog number. For
example, the RPSSN8M12A has an M12 connector.
Digital DC Input Modules
RPSSN8M8A
RPSSN8M12A
RPSSN8M23A RPSSP8M8A
RPSSP8M12A
RPSSP8M23A
Number of Inputs 8 Sinking 8 Sourcing
Keyswitch Position 1 1
Voltage, On-State
Input, Nom.
24VDC 24VDC
Voltage, On-State
Input, Min.
10VDC 10VDC
Voltage, On-State
Input, Max.
28.8VDC 28.8VDC
Input Delay Time,
ON to OFF
0.5 ms Hardware
+ (0…65 ms
selectable)* 0.5 ms Hardware
+ (0…65 ms
selectable)*
Current, On-State
Input, Min.
2 mA 2 mA
Current, On-State
Input, Max.
5 mA 5 mA
Current, Off-State
Input, Max.
1.5 mA 1.5 mA
PointBus Current
(mA)
75 75
Power Dissipation,
Max.
1.0 W @ 28.8VDC 1.0 W @ 28.8VDC
* Input ON-to-OFF delay time is the time from a valid input signal to recognition
by the module.
Digital DC Output Modules
RPSST8M8A
RPSST8M12A
RPSST8M23A
Number of Outputs 8 sourcing
Keyswitch Position 1
Voltage, On-State Output, Nom. 24VDC
Voltage, On-State Output, Min. 10VDC
Voltage, On-State Output, Max. 28.8VDC
Output Current Rating, Max.
3.0 A per module, 1.0 A
per channel
PointBus Current (mA) 75
Power Dissipation, Max. 1.2 W @ 28.8VDC
Serial Bus System