SATEC SA300 ezPAC Operation Manual - Manual (Page 71)

Chapter 7 Programming the SA300 Programming Relay Outputs
SA300 Substation Automation Unit 71
Programming Relay Outputs
The SA300 supports up to four expansion Relay Output (RO) modules with a total of
32 relays (RO1 to RO32). I/O numbers are automatically assigned to the relay
outputs in the order of connection when the device is powered up.
The SA300 allows you to program all relay outputs regardless of whether they are
actually present in your device or not. The relays that are not present in the device
are considered “virtual” relays and can be used in the same way as real relays with
the only difference that they cannot transmit signals outside of the device. The
“virtual” relays may be with the control setpoints as temporary event storage to
transfer events between setpoints.
Each relay can be operated either locally from the control setpoints in response to an
internal or external event, or by a remote command sent through communications, or
can be directly linked to an internal pulse event produced by the device.
To configure the relay outputs in your device, select General Setup from the Meter
Setup menu, and then click on the Relay Outputs tab.
The available relay options are described in the following table:
Option Format/Range Default Description
Operation mode Unlatched
Latched
Pulse
KYZ
Unlatched Defines the behavior of the relay in
response to local and remote commands
Unlatched mode: the relay goes into its
active state when the control setpoint is in
active (operated) state, and returns into
its non-active state when the setpoint is
released.