Filter
Top Products
63230-300-212 Chapter 5—Input/Output Capabilities
April 2001 Relay Output Operating Modes
75
© 2001 Schneider Electric All Rights Reserved
Before we describe the 11 available relay operating modes, it is important to
understand the difference between a relay configured for remote (external)
control and a relay configured for circuit monitor (internal) control.
Each relay output defaults to external control, but you can choose whether
the relay is set to external or internal control:
• Remote (external) control—the relay is controlled either from a
PC using
SMS or a programmable logic controller using commands via
communications.
• Circuit monitor (internal) control—the relay is controlled by the circuit
monitor in response to a set-point controlled alarm condition, or as a pulse
initiator output. Once you’ve set up a relay for circuit monitor control, you
can no longer operate the relay remotely. However, you can temporarily
override the relay, using
SMS.
NOTE: If any basic setup parameters or I/O setup parameters are modified,
all relay outputs will be de-energized.
The 11 relay operating modes are as follows:
• Normal
—
Remotely Controlled:
Energize the relay by issuing a command from
a remote
PC or programmable controller. The relay remains energized
until a command to de-energize is issued from the remote
PC or
programmable controller, or until the circuit monitor loses control
power. When control power is restored, the relay will be re-energized.
—
Circuit Monitor Controlled:
When an alarm condition assigned to the
relay occurs, the relay is energized. The relay is not de-energized until
all
alarm conditions assigned to the relay have dropped out, the circuit
monitor loses control power, or the alarms are over-ridden using SMS
software. If the alarm condition is still true when the circuit monitor
regains control power, the relay will be re-energized.
• Latched
—
Remotely Controlled:
Energize the relay by issuing a command from
a remote
PC or programmable controller. The relay remains energized
until a command to de-energize is issued from a remote
PC or
programmable controller, or until the circuit monitor loses control
power. When control power is restored, the relay will not be re-
energized.
—
Circuit Monitor Controlled:
When an alarm condition assigned to the
relay occurs, the relay is energized. The relay remains energized—
even after all alarm conditions assigned to the relay have dropped
out—until a command to de-energize is issued from a remote PC or
programmable controller, until the high priority alarm log is cleared
from the display, or until the circuit monitor loses control power. When
control power is restored, the relay will not be re-energized if the alarm
condition is not TRUE.
RELAY OUTPUT
OPERATING MODES