Publication PSS-SG001A-EN-P – June 2005
Isysnet 7
Relay Output Module
PSSTR4M12A
Number of Outputs 4 Form A (N.O.) relays, isolated
Keyswitch Position 7
Output Delay Time,
ON to OFF, Max. 26 ms*
Contact Resistance,
Initial 30 mΩ
Current Leakage, 1.2 mA and bleed resistor thru
Off-State Output, Max. snubber circuit @ 240V ac
PointBus Current (mA) 90
Power Dissipation, Max. 0.5 W
*Time from valid output off signal to relay deenergization by module.
Analog I/O Modules
The Isysnet analog modules support: on-board, channel-level
data alarming (four set-points per channel); scaling to
engineering units; channel-level diagnostics (electronic bits
and LEDs); and integer format.
Choose analog I/O modules when you need:
• Individually configurable channels to use the module(s)
with a variety of sensors.
• On-board scaling to eliminate the need to scale the data in
the controller. Controller processing time and power are
preserved for more important tasks, such as I/O control,
communications, or other user-driven functions.
• On-line configuration. Modules can be configured in the
RUN mode using the programming software or the control
program. This allows you to change configuration while the
system is operating. For example, the input filter for a
particular channel could be changed, or a channel could be
disabled based on a batch condition. To use this feature, the
controller and network interface must also support this
feature.
• Over- and under-range detections and indications. This
eliminates the need to test values in the control program,
saving valuable processing power of the controller. In
addition, since alarms are handled by the module, the
response is faster and only a single bit per channel is
monitored to determine if an error condition has occurred.
• Ability to direct output device operation during an
abnormal condition. Each channel of the output module
can be individually configured to hold its last value or
assume a user-defined value on a fault condition. This
feature allows you to set the condition of your analog
devices, and therefore your control process, which may help
to ensure a reliable shutdown.
• Ability to individually enable and disable channels.
Disabling unused channels improves module performance.
• Selectable input filters This lets you select the filter
frequencies for each channel that best meets the
performance needs of your application based on
environmental limitations. Lower filter settings provide
greater noise rejection and resolution. Higher filter settings
provide faster performance. Note: The analog modules
provide four input filter selections.
• Selectable response to broken input sensor. This feature
provides feedback to the controller that a field device is not
connected or operating properly. This lets you specify
corrective action based on the bit or channel condition.
• High accuracy. The modules share a high accuracy rating
of ±0.1% of full-scale accuracy at 25 °C.
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