4
4
C
C
H
H
A
A
N
N
N
N
E
E
L
L
A
A
N
N
A
A
L
L
O
O
G
G
U
U
E
E
T
T
R
R
A
A
N
N
S
S
M
M
I
I
T
T
T
T
E
E
R
R
9
9
O
O
F
F
3
3
0
0
1
1
2
2
0
0
-
-
1
1
8
8
8
8
-
-
1
1
2
2
T
T
Y
Y
P
P
E
E
S
S
I
I
L
L
B
B
U
U
S
S
-
-
T
T
X
X
4
4
A
A
(
(
G
G
)
)
U
U
S
S
E
E
R
R
'
'
S
S
M
M
A
A
N
N
U
U
A
A
L
L
I
I
s
s
s
s
u
u
e
e
:
:
0
0
5
5
fault is generated. This fault can be transmitted as a digital signal on any valid configurable
SILBUS channel address.
Each analogue input is also compared with up to five configurable rising or falling set
points. If the analogue input signal passes a set point level a digital alarm will be generated.
This alarm can be configured to transmit on any valid SILBUS channel address.
2
0
4
4-20mA SIGNAL PROCESS (NORMAL) RANGE
6
I/P<4mA FAULT K4
8
4-20mA SIGNAL HARDWARE FAULT RANGE
1
0
0-5% LEL CH4
1
2
2
0
1
4
1
8
1
6
S
E
N
S
O
R
5.0%
2.5%
DO NOT CONFUSE SET POINTS WITH
3.75%
RISING SET POINT @ 1.25% J1 (TRIP)
RISING SET POINT @ 0.9% J2 (WARNING)
RISING SET POINT @ 0.6% J3 (WARNING)
INPUT 3
INPUT 1
m
A
C
H
4
3.5mA
2
0
4
6
I/P<4mA FAULT K3
8
1
0
0-25% V/V O2
1
2
2
0
1
4
1
8
1
6
S
E
N
S
O
R
25.0%
12.5%
6.25%
18.75%
FALLING SET POINT @ 19.5% J5 (TRIP)
FALLING SET POINT @ 20.3% J6 (WARNING)
21.875%
4-20mA HARDWARE SIGNAL FAULTS
m
A
O
2
3.5mA
SETPOINTS ARE FOR PROCESS ALARMS
FAULTS ARE FOR 4-20mA SIGNAL FAULTS
RISING SET POINT @ 21.1% J7 (WARNING)
Figure 1 Set point and Fault operation
A common hysteresis level can be configured for all inputs to stop the fault signals or the
set point alarm signals from chattering because of noise on the analogue input signals.
The above figure shows the difference between set points and signal faults, set points are
reserved for process alarms while faults are reserved for 4-
20mA signal issues like ‘less
than 4mA’. Both set points and faults may be configured to generate a digital signal on any
valid SILBUS channel address but only faults transmit 4-20mA embedded error signals in
the Analink protocol.
An analogue input may be configured with just rising or just falling or both rising and falling
set points; the maximum number of set points shall not exceed 5 for each input channel.
Only one fault can be set per analogue input channel.
All configurable aspects of the four channel analogue transmitter can be programmed via
the console port. The transmitter will operate with 8, 16, 32, 64 and 128 channel SILBUS
networks and will automatically configure to the number of channels of the connected
SILBUS network.
5 OPERATING INSTRUCTIONS
The four channel analogue transmitter does not require any operator action to operate once
it has been installed within an IP54 host enclosure and configured correctly.
An understanding of the various flash sequences of the orange status LED may be required
to help in the trouble shooting and maintenance of the entire SILBUS network installation.
The status LED provides information on the operational status of the transmitter and the
connected SILBUS network. This information includes correct microprocessor operation,
