18
SafeGuard Controller User Manual
MAN-0115 Rev 0
•
Turning
Piezo Alarm ON
causes the audible piezo to duplicate the action of the
horn relay. This feature may be used to provide a low decibel indication of the status
of the system’s horn.
•
Alarm 1 & Alarm 2
menus control how the alarm level from each channel will
affect the common horn relay. Choices are
OFF
,
ON
or
BEEP
(one Hz. Pulsating).
As an example, A2 conditions might pulse the horn (
BEEP
) and A1 conditions cause
a steady horn (
ON
). Any other combination of these 3 choices is possible for A1 and
A2 levels affecting the horn relay. This feature is very useful since it allows the horn
relay to serve as another level A1, level A2, or both; for channels 1-16, 1-8 or 9-16.
Individual channel alarms may also be configured to not affect the Horn relay on a
channel by channel basis (see section 2.2.2).
•
Failsafe
&
Horn Group
menu entries are identical to the descriptions for menus
Common Relay 1
&
Common Relay 2
in section 2.3.1.
•
Turning
Acknowledge
OFF
allows the common Horn relay to drive devices other
than horns or sirens such as a light or a fan.
•
Display Alm YES
forces the LCD to display the Bar Graphs screen upon any new
alarm. This feature is offered to satisfy applications requiring channels in alarm to be
displayed automatically (all channels are displayed on the Bar Graphs screen).
2.3.4 COMM
PORT
MENUS
The system Comm Port menu allows setting RTU
Slave ID
address,
Slave Baud
rate,
Parity
and
UART Timer
for the comm2
slave
Modbus serial port (comm1
master
port
ID settings are per channel as described in section 2.2.4). This slave port may be used to
transfer the SafeGuard Controller data to a host device such as a PC, PLC, DCS or even
another SafeGuard Controller. The slave port is addressable, allowing many SafeGuard
Controllers to be connected to a single RS-485 cable. The
UART Timer
setting is
disabled with 00 seconds entered. Entering a value causes the comm2
slave
Modbus
serial port to reinitialize if no modbus query is processed within this time period. This
ensures against serial port lockup. Section 5 of this manual provides important
information describing how to interface to the SafeGuard Controller’s Modbus slave port.
The
Mastr TO
(master time out) and
Mastr PR
(master poll rate) menu items affect the
SafeGuard Controller’s
master
Modbus port.
Time out
sets length of time in milliseconds
before a communications error. Three consecutive timeout errors must occur before a
communication error is indicated. This item is useful for optimizing throughput to the
SafeGuard Controller from other slave RTU’s.
Poll Rate
sets frequency of data requests
to the RTU’s in milliseconds. This is useful when an RTU is limited in how fast it may
respond to consecutive data requests.
