24
SafeGuard Controller User Manual
MAN-0115 Rev 0
3.1
INPUT / OUTPUT OPTIONAL PCB’s
Telephone style RJ11 connections are used to add optional 8 channel analog and digital
I/O. A screen appears briefly after power up indicating what options are connected and
for which channels. This information is also available from the
Diagnostics Mode
described in Section 4.
A N A L O G
P R E S S N E X T K E Y T O E X I T
I N P U T
1- 8
F OU N D
A N A L OG
I N P U T
9 - 16
F OU N D
A N A L OG
OU T P U T
1- 8
F OU N D
A N A L OG
OU T P U T
9 - 16
F O U N D
A L A R M2
R e l a y
1- 8
F O U N D
A L A R M2
I N P U T
9 - 16
F OU N D
Figure 3.2
3.1.1
OPTIONAL ANALOG INPUT PCB # SG10-0158
Many transmitters (detectors) have analog output signals and the 12 bit
Analog Input
PCB
, shown in Figure 3.3, is available to accept these. TB1, with 24 positions, offers 3
terminals per channel for distributing power and receiving analog inputs. These are
EXC
and
HI
/
LO
inputs. TB2, with only two positions, is for connecting the power supply for
powering external transmitters. Precision 100 ohm resistors (R1 – R8) between each
channel’s
IN LO
and
IN HI
terminals are socketed termination resistors for 4-20mA
inputs. These may be removed if voltage inputs are to be applied.
EXC
and
IN LO
terminals are bussed together internally.
EXC
terminals are tied
directly to TB2-1 (+) and
IN LO
terminals are tied to TB2-2 (-). Bussing allows
transmitter power to be brought into the system at a single point (TB2) and distributed
back out at each channel’s
EXC
/
IN LO
terminals to simplify field wiring. Figure 3.3
includes typical wiring to 2 & 3 wire 4-20mA transmitters.
JP1 determines if the 8 analog inputs are applied to channels 1-8 or channels 9-16.
Connecting more than 8 analog inputs requires 2 PCB’s with one’s JP1 set for channels
1-8 and the other set for channels 9-16.
For a 3 wire
transmitter (detector), the power (+) wire from the transmitter is connected
to the
EXC
terminal on the SafeGuard Analog Input Board, the power (-) wire is
connected to
LO
terminal on the SafeGuard Analog Input Board and the 4-20mA signal
wire is connected to
HI
terminal on the SafeGuard Analog Input Board .
For a 2 wire
transmitter (detector), the power (+) wire is connected to the
EXC
terminal
on the SafeGuard Analog Input Board, and the 4-20mA signal wire is connected to
HI
terminal on the SafeGuard Analog Input Board. See Figure 3.3
