Parker H Series, Installation & Service Instructions Manual

Page: 274 / 344

Publication PSS-SG001A-EN-P – June 2005
6 Isysnet
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 PSSN8M12A has an M12 connector.
Digital DC Input Modules
PSSN8M8A PSSP8M8A
PSSN8M12A PSSP8M12A
PSSN8M23A PSSP8M23A
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, 0.5 ms hardware 0.5 ms hardware
ON to OFF + (0…65 ms + (0…65 ms
selectable)* 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, 1.0 W @ 28.8VDC 1.0 W @ 28.8VDC
Max.
* Input ON-to-OFF delay time is the time from a valid input
signal to recognition by the module.
Digital DC Output Modules
PSST8M8A
PSST8M12A
PSST8M23A
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