Omega DRA-CSM-1 Installation guide

DRA-CSM-1
CURRENT MULTIPLEXER
User’s Guide
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Contents
1. GENERAL DESCRIPTION
2. MOUNTING INSTRUCTIONS
3. REPLACING FUSES
4. ASSEMBLY
5. SUPPLY VOLTAGE
6. CONNECTING TRANSMITTERS TO THE MULTIPLEXER
6.1 Two-Wire Transmitter
6.2 Three-Wire Transmitter
6.3 Four-Wire Transmitter
7. CONTROL
7.1 Enable/Test
7.2 Address
7.3 Address Polarity
7.4 Control Tables
7.4.1 True Low Setting
7.4.2 True High Setting
8. MULTI-DROP CONFIGURATION
9. SPECIFICATIONS
1

1.GENERAL DESCRIPTION
WARNING: Never connect a voltage source as an input to the
multiplexer. Its internal low dynamic impedance
will cause immediate fuse blowing.
3. REPLACING FUSES
2. MOUNTING INSTRUCTIONS
2
The DRA-CSM-1 is a multiplexer for 16 analog 4-20mA current loops.
The transmitter/transducer currents are input via "I" terminals. Each input is
protected by a 63mA fuse.
The current input is steered either to the output ("lo") terminal or to the negative
(COM) terminal of the power supply (PWR). Fifteen channels are routed to the
COM and only the selected one is routed to the output terminals, thus ensuring
a continuous and uninterrupted current loop.
The multiplexer's channel selection is controlled by 4 address lines, generated by
the PLC's discrete output module.
The unit provides 16, current limited (~40mA), voltage supply ("V") outputs. These
outputs are derived from the mux's power supply input and are used to feed two-
wire transmitters. The current limitation avoids fuse blowing in cases of short-
circuit of the transmitters' leads.
The DRA-CSM-1 is designed for standard DIN rail mounting.
Place the unit on the upper part of the mounting rail with the fastening tab facing
down. Loosen the tab slightly, using a suitable flat screwdriver, and attach the unit
to the rail. After releasing the tab, make sure that the unit is fastened securely in
place.
To replace a blown fuse, disassemble the unit as follows:
a. Take off both terminal strips by removing the four screws at the edges.
Note: This does not require disconnecting the cables connected to the strips.
b. Remove the front panel using a suitable flat screwdriver. Press down gently on
the plastic springloaded tabs located in the slots on either side of the unit.

4. ASSEMBLY
Note: The terminal strips are polarized and must not be placed backwards.
WARNING: Never install a channel fuse rated more than
100mA, and main fuse rated more than 800mA.
5. POWER SUPPLY
Figure 1.
The DRA-CSM-1 is supplied by a regulated power supply at a range of 15 to
40Vdc. This voltage is used to feed the connected transmitters via the multiplexer's
"V" terminals.
The DRA-CSM-1 unit adds about 350Wto the current loop
5.1 MINIMUM SUPPLY VOLTAGE
The minimum supply voltage required to operate the multiplexer and the transmitters
fed by it can be calculated using the following equation:
Vmin = Vt + 0.02*(Rs+350)
3
The DRA-CSM-1 unit includes three printed circuit cards designated as P.N 7016,
P.N 7017 and P.N 7030.
The printed circuit cards should occupy the slots in the enclosure according to fig1.
c. Disconnect the flat connectors from the front panel.
d. Replace the blown fuse.
Connect the flat cables between the
printed circuit cards and the front
panel. The front panel must be
inserted into the grooves on both
sides of the case while pressing down
until a distinct "click" is heard.
Assembly is completed by laying the
terminal strips in place.

Where:
Vmin - The minimum required supply voltage
Vt - The minimum required voltage specified for the connected
transmitter (at load=0)
Rs - Total loop load including leads' resistance and PLC's input impedance
Example:
The minimum operational voltage of a given transmitter is 12V.
The total loop load is 250W.
Solving the above voltage:
Vmin= 24Vdc
6. CONNECTING THE TRANSMITTERS TO THE MULTIPLEXER
6.1 TWO-WIRE TRANSMITTER
A Two-Wire transmitter is connected
so that its positive terminal is connected
to the "V" terminal, and its negative
terminal is connected to the "I" terminal.
(see fig 2.)
Figure 2.
6.2 THREE-WIRE TRANSMITTER
A Three-Wire transmitter is connected
so that its positive terminal "+V" is
connectedto themultiplexer "V"terminal,
its negative terminal "-V" is connected
to the multiplexer's "COM" terminal and
the current output terminal "Io" is
connected to the DRA-CSM-1 "I"
terminal. (see fig 3).
4
Figure 3.

6.3 FOUR-WIRE TRANSMITTER
A Four-Wire transmitter is connected
so that its positive terminal is
connected to the "I" terminal, and its
negative terminal is connected to the
"COM" terminal. (see fig 4).
Figure 4.
7. CONTROL
The DRA-CSM-1 unit is controlled via
four address lines and one E/T
(Enable/Test) line. The control terminals
(Address and Enable), were designed
to receive control signals from TTL levels
up to 60V so that almost any PLC's DC
output module can be used. (see fig 5).
5
Figure 5.
7.1 ENABLE/TEST
The unit is enabled when "E/T" is in logical "0" (low) state. In a disabled state,
the DRA-CSM-1 outputs no current and reflects a Hi-Z state.
The disabled state of the DRA-CSM-1 multiplexer is used to check the functioning
of all the current inputs. This is performed by simultaneously injecting current pulses
to all 16 channels which cause the functioning channels to flash. This is a quick
and useful means to indicate a blown fuse.
7.2 ADDRESS
The required channel is selected by four address lines.
The operating voltage levels are:
"0" state 0V < Vaddress < 0.4V
"1" state 5V < Vaddress < 60V

6
7.3 ADDRESS POLARITY (see fig 6)
Address polarity is controlled by three
internal pins and a jumper over two of
them, accessible behind the Enable
terminal. The unit is supplied with the
jumper set for "true low" control logic,
i.e. "0000" selects channel #16, and
"1111" selects channel #1.
Moving the jumper to the second
alternative, reverses the logic.
Note: If the PLC and the DRA-CSM-1 are powered by separate power
supplies, then the negative terminals should be connected.
7.4 CONTROL TABLES
7.4.1 "True Low" Setting
7.4.2 "True High" Setting
ADDRESS BUS E/T OUTPUT
CHANNEL
A0A1A2
A3
1
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0
0
0
0
0
9
10
11
12
13
1
1
1
x
1
1
1
x
0
1
1
x
1
0
1
x
0
0
0
1
14
15
16
TEST MODE
ADDRESS BUS E/T OUTPUT
CHANNEL
A0A1A2
A3
0
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0
0
0
0
0
1
2
3
4
5
0
0
0
x
1
1
1
x
0
1
1
x
1
0
1
x
0
0
0
1
6
7
8
TEST MODE
Figure 6.
ADDRESS BUS E/T OUTPUT
CHANNEL
A0A1A2
A3
1
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0
0
0
0
0
8
7
6
5
4
1
1
1
x
1
1
1
x
0
1
1
x
1
0
1
x
0
0
0
1
3
2
1
TEST MODE
ADDRESS BUS E/T OUTPUT
CHANNEL
A0A1A2
A3
0
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0
0
0
0
0
16
15
14
13
12
0
0
0
x
1
1
1
x
0
1
1
x
1
0
1
x
0
0
0
1
11
10
9
TEST MODE

7
8. MULTI-DROP CONFIGURATION
In the disabled state (E=1), the multiplexer outputs no current and exhibits a high
Z state. This mode allows the connection of several DRA-CSM-1 units to one PLC's
analog input, by tying their output terminals and the address lines in parallel, and
applying individual Enable lines to select the desired multiplexer by disabling all
but one. (see fig 7)
Figure 7
ENABLE 1
MSB
LSB
ENABLE 2
DISCRETE
OUTPUT
MODULE
ANALOG
INPUT
MODULE
PLC
ANALOG +
ANALOG
-
POWER
SUPPLY

8
SUPPLY
Supply Voltage
Supply Current Consumption
FUSES
Main Fuse
Channel Fuse
TEMPERATURE
Operating
Storage
HUMIDITY
HOUSING
Box
Terminals
WEIGHT
DIMENSIONS
15 - 40 Vdc (regulated)
15mA in operation mode,
120mA in Test mode
(transmitters not included)
630mA, Fast Blow (20x5 mm)
63mA, Fast Blow (20x5 mm)
0 to 70
o
C (32 to 158
o
F)
-25 to +85
o
C (-13 to 185
o
F)
5 to 95% Relative humidity, non condensing
Plastic Polycarbonate
According to IP50 DIN 40050
According to IP20 DIN 40050
0.75 Kg. (1.5 lb.)
73Hx200Wx121mmD
(2.88"x7.88"x4.76")
INPUTS
ANALOG INPUTS
(Reverse Polarity Protected)
Max Input Current
CONTROL INPUTS
Logic Levels
Logic Polarity
OUTPUTS
CURRENT OUTPUT
Switching time
Accuracy (Refer to Current Input)
"V" TERMINALS
"V" Voltage
Limitation Current
Automatic Temperature Shut-down
INDICATORS
16, 0/4-20mA Current loop
30mA
4 Address inputs
E/T Enable/Test input
Low: "0" < 0.4V
High: 5 < "1" < 60V
Selectable - True High/True Low
4-20mA, Current Loop
10mSec (into a resistive load)
0.01% maximum @ for the entire temperature range
V supply - 2.5V
40 ±1mA
Above 80
o
C
1 Yellow LED, Power-On indicator
16 Red LEDs, current activity indicators
9. SPECIFICATIONS

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