Ross Controls ROSS MODULAR I - Manual (Page 42)

42 © 2012, ROSS CONTROLS ® . All Rights Reserved.
Analog I/O Modules
The Serial Bus 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 ±ha 0.1% of full-scale accuracy at 25 °C.
Relay Output Module
RPSSTR4M12A
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 m Ω
Current Leakage,
Off-State Output, Max. 1.2 mA and bleed resistor thru
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.
Serial Bus System