E.F. Johnson Company 242-20X1-213, Руководство пользователя

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CIRCUIT DESCRIPTION
6-38
August 2000
Part No. 001-2001-200
6.11 INTERFACE ALARM CARD
This card utilizes the information required to
operate the alarms designated in the programming of
the repeater. Data is received on the address bus from
the MPC for the; operation to perform, the processor
and external memory, open and close relays on the
outputs, and receive alarm indications on the inputs.
This information is either routed to external devices or
alarm outputs can be wired to alarm inputs (see Figure
4-10).
The Interface Alarm Card (IAC) contains 4-input
contacts and 4-output contacts. The 4-inputs can be
disabled, energized or de-energized. The 4-output
relays are dry contacts that have a 2A rating and can
be either normally open or normally closed.
The electromechanical relay outputs are com-
prised of eight SPDT (normally open) relays. The
relays are all open at power-on. Data to the relay is
latched by a write to the base address.
The IAC activates relays when alarm trigger
events occur. The IAC monitors for alarm activity in
the system and can set the various output relays as
defined by the user during programming. When an
external alarm is set it can be monitored from a remote
location. Refer to Section 4.3.3 for alarm
programming.
6.11.1 RELAY OUTPUTS
The alarm relay outputs are provided via a termi-
nal block on the back of the repeater (see Figures 6-13
and 6-14).
The alarm outputs are on the terminal block at the
rear of the repeater.
6.11.2 ISOLATED INPUTS
The isolated alarm inputs are provided via a ter-
minal block on the back of the repeater (see Figures 6-
13 and 6-14).
The isolated inputs are driven by either AC or DC
signals. The active high inputs can be set by switches
to be polarity sensitive, non-polarity sensitive or add a
resistance in series to dissipate unused power (see Fig-
ure 6-15).
The active low inputs can also be set for either
+5V or +15V operation when a ground closure is
required to provide an active alarm.
Figure 6-13 4 I/O J1 ALARM OUTPUTS
Figure 6-14 4 I/O J2 ALARM OUTPUTS
25
26
ALARM IN
ALARM OUT
I/0
13
1
2
4-
3-
3+
4+
3+
4-
3-
4+
IA
C
4
1
EX
TO
U
T1
CO
M
4
9
C
O
M
50
TX
D
IN
RX
V
O
ICE
TX
V
OI
C
E
RX
W
BA
ND
C
OM
M
6
SQ
E
N
E
X
TR
E
Q2
CO
M
1
7
SY
N
C
IN
TX
D
OU
T
C
O
M
5
3
CO
M
5
4
CO
M
5
5
33
34
AL
AR
MS
1
IN
+
2 IN
+
1
O
UT
+
2 O
U
T
+
2 O
U
T
-
1 O
U
T
-
2 IN
-
1
IN -
AC
FA
IL
1
2
J2