Impulse SCMPB01 User Manual
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Accessories for SCM5B Analog Modules
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Features
1-, 2-, 8-, 16-Position Backpanels
19-Inch Mounting Rack For Backpanels
Multiplexed and Non-Multiplexed Backpanels
Interface Cables
SCMPB01
16-Position Analog I/O Backpanel,
Non-Multiplexed
Description
The SCMPB01 16-channel backpanel (Figure 1) can accept any of the SCM5B
analog modules in any mixture. It can be mounted on the SCMXRK-002 19-
inch metal rack. The SCMPB01 has 16 non-addressable analog I/O signal
channels which provides each module with its own analog bus. The module
output switch is continuously on when using this backpanel and all sixteen
module outputs are simultaneously accessible to high-speed data acquisition
(ADC) boards. A set of inter-channel bridge jumpers permits connecting an input
modules output to an output modules input, providing two levels of isolation. A
temperature sensor is mounted on each channel to provide cold junction
compensation for thermocouple input modules (See Figure 2 for schematic).
Field connections are terminated with four screw terminals at each module site.
Use system interface cable SCMXCA004-XX for connection to the host system.
Isolated Analog Signal Conditioning Products
Module Evaluation Board
Cable-to-Screw-Terminal Interface Board
Power Supplies
Specifications
Operating Temperature 40°C to +85°C
ATEX Group II, Category 3 20°C to +40°C
Relative Humidity 95% non-condensing
Interface Connector:
Field high density screw clamp, 14 AWG max
System 26-pin, male header connector
SCM5B
Figure 1: SCMPB01 Analog I/O Backpanel
46
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Isolated Analog Signal Conditioning Products
SCM5B
SCM5B
Figure 2: SCMPB01 Schematic
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47
Isolated Analog Signal Conditioning Products
SCM5B
Electrical
P1 and P2 Connector
Connection to the host system is made at connectors P1 and P2. These
connectors are electrically equivalent. Two connectors are provided to allow
both analog input and analog output from host systems having individual
input and output connectors.
Adjacent Channel Jumpers
Adjacent channels may be connected together to provide an isolated output
signal from an isolated input module, providing two levels of 1500V isolation.
This capability is provided with the 15 jumpers labeled JP1 through JP15 on
headers E1, E2, and E3. A simplified drawing of the SCMPB01 schematic for
Channel 1 through 4 is shown in Figure 3.
Example: Assume an SCM5B30 input module is installed in Channel 1 position
and an SCM5B39 output module is installed in Channel 2 position. If JP1 is
installed, the output of Channel 0 is connected to the input of Channel 1, which
provides two levels of 1500V isolation.
Ordering Information
Part Number Description
SCMPB01 Standard 16-channel backpanel.
SCMPB01-1 SCMPB01 without cold junction compensation circuits. Use
when cost savings is desired and thermocouple input modules
SCM5B37 and SCM5B47 will not be used.
SCMPB01-2 SCMPB01 with DIN rail mounting option. The backpanel
is mounted on a piece of anodized aluminum, which is captured
by the SCMXBEFE DIN rail mounting elements. The backpanel
is shipped fully assembled.
SCMPB01-3 SCMPB01-1 with DIN rail mounting option. See SCMPB01
and SCMPB01-2 for details.
If the host system has the capability, this allows measuring the SCMPB01
ground potential.
For proper operation of the output switch or track-and-hold circuit when using
the SCMPB01/05 backpanels, a current path must exist between the host control
logic power common and module I/O Common (module pin 19). This path
can be established on the SCMPB01 via jumper J4. If this connection exists
elsewhere in the system, jumper J4 should be removed since possible ground
loops could exist. Other connections of power ground and signal ground
usually occur at the A/D or D/A converter of the host measurement system.
More information on grounding can be found in Application Note AN502.
Figure 3: SCMPB01 Adjacent Channel Jumpers
Power
The SCMPB01 backpanel requires external +5VDC ±5% power. The chassis
mounted SCMXPRE-003 or SCMXPRT-003 power supplies have adequate
capacity to power any combination of modules.
Fusing
The SCMPB01 backpanel power is fuse protected through F1. This is a
Littlefuse type 252007, 7 amp fuse. Zener diode DZ1 provides extra protection
by clamping the input power voltage to +5.6V. If the input supply voltage
connection is reversed, this zener diode will be forward biased and fuse F1
will be blown.
Grounding
Figure 4 details the optional ground jumper configuration available on the
SCMPB01 backpanel. Jumpers J1, J3, and J4 are factory installed.
Jumper J1 connects the AGND shield wires (pins 3, 6, 9, 12, 15, 18, 21, and
24) to the backpanel signal ground. This provides a ground connection between
the host system and backpanel. Jumper J1 is required if output modules
(SCM5B39, SCM5B49) are used, or if there is no high impedance sense input
(input low of a differential or pseudo-differential system) on the host measurement
system.
Jumper J3 connects the SENSE line (pin 25) to the backpanel signal ground.
Figure 4: SCMPB01 Grounding Diagram
If the connection of power common and AGND shield wires exist in the host
measurement system, an optional resistive connection between AGND and
the backpanel signal ground can be made via R
ohms; 100 ohms is a recommended value. Jumper J2 can be used to connect
the SENSE line to R
when this ground configuration is used.
1
. R1 can be as large as 10K
1
For full protection against large electrical disturbances on the field-side of the
SCM5B modules, a #10-32 ground stud is provided on the backpanel. An
electrical connection between this ground stud and system ground should be
provided with a large gauge wire of the shortest possible length. When this
connection is made, a possible ground loop could result through the AGND
shield wires and backpanel signal ground. If the application involves only input
modules and a differential input is used by the host measurement system, J1
should be removed. Remember that J1 is required if output modules are used
or if the host system does not have differential inputs.
48
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Isolated Analog Signal Conditioning Products
SCMPB02
16-Position Analog I/O Backpanel, Multiplexed
SCM5B
SCM5B
Description
The SCMPB02 16-channel backpanel (Figure 5) can accept any of the SCM5B
analog modules in any mixture. It can be mounted on the SCMXRK-002 19-
inch metal rack. The SCMPB02 has two analog buses; one for analog input
and one for analog output. This two-bus configuration takes advantage of the
switch controlled outputs on the input modules and the track-and-hold inputs on
the output modules. A temperature sensor is mounted on each channel to
provide cold junction compensation for thermocouple input modules (See
Figure 6 for schematic). Field connections are terminated with four screw
terminals at each module site. Up to four SCMPB02 backpanels may be daisy-
chained. Use SCMXCA004-XX cable for daisy chaining and connecting to host
computer.
Specifications
Operating Temperature 40°C to +85°C
ATEX Group II, Category 3 20°C to +40°C
Relative Humidity 95% non-condensing
Interface Connector:
Field high density screw clamp, 14 AWG max
System 26-pin, male header connector
Address Input Logic Levels:
Max Logic 0 0.8V
Min Logic 1 2.0V
II Input Current, 0 or 1 0.1µA max at 25°C
1.0µA max 25°C to +85°C
RD EN\ or WR EN\ Signal
Delay from Connector P1 to
Channels 1-16
Standalone (address 0-15) 51ns at 25°C
64ns at 25°C to +85°C
Expanded (address 16-63) 100ns at 25°C
126ns at 25°C to +85°C
Figure 5: SCMPB02 Analog I/O Backpanel
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Isolated Analog Signal Conditioning Products
SCM5B
Figure 6: SCMPB02 Schematic
50
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Isolated Analog Signal Conditioning Products
SCM5B
Electrical
P1 Connector
The 26 pin P1 connector provides the signal interface between the SCMPB02
backpanel and the host measurement system. Two separate analog bus
connections are provided; one for analog input signals and one for analog output
signals. Two sets of six address lines and an enable pin allow input and output
modules to be independently multiplexed onto their respective analog signal
bus. R0 thru R5 and RD EN\ are used for input modules, and W0 thru W5 and
WR EN\ are used for output modules.
Address Selection
The SCMPB02 backpanel has address decoding circuitry to allow multiplexing
any combination of up to 16 input or output modules. Capability is also provided
in the address decode circuitry to expand the system to 64 channels (four
SCMPB02 backpanels) of multiplexed input or output. Jumpers on HD10
header, E1 and E2 group, select which set of 16 addresses are assigned to a
particular backpanel. The E1 group assigns a set of 16 addresses for input
modules, and the E2 group assigns a set of 16 addresses for output modules.
The table below shows the correlation of jumper position to address range.
E1 Jumper Pos E2 Jumper Pos Address Range/Mode
4 4 0-15, STAND ALONE
3 3 48-63, EXPANDED
2 2 32-47, EXPANDED
1 1 16-31, EXPANDED
0 0 0-15, EXPANDED
To connect multiple SCMPB02 backpanels in this expanded configuration, use
interconnect cable SCMXCA004-XX.
Power
The SCMPB02 backpanel requires external +5VDC ±5% power. The chassis
mounted SCMXPRE-003 or SCMXPRT-003 power supplies have adequate
capacity to power any combination of modules.
Fusing
The SCMPB02 backpanel power is fuse protected through F1. This is a Littlefuse
type 252007, 7 amp fuse. Zener diode DZ1 provides extra protection by
clamping the input power voltage to +5.6V. If the input supply voltage connection
is reversed, this zener diode will be forward biased and fuse F1 will be blown.
Ordering Information
Part Number Description
SCMPB02 Standard 16-channel backpanel.
SCMPB02-1 SCMPB02 without cold junction compensation circuits. Use
SCMPB02-2 SCMPB02 with DIN rail mounting option. The backpanel
SCMPB02-3 SCMPB02-1 with DIN rail mounting option. See SCMPB02
For proper operation of the output switch or track-and-hold circuit when using
the SCMPB02/06 backpanels, a current path must exist between the host
control logic power common and module I/O Common (module pin 19). This
path can be established on the SCMPB02 via jumper J4. If this connection exists
elsewhere in the system, jumper J4 should be removed since possible ground
loops could exist. Other connections of power ground and signal ground usually
occur at the A/D or D/A converter of the host measurement system. More
information on grounding can be found in Application Note AN502.
If the connection of power common and SIG COM shield wires exist in the host
measurement system, a resistive connection between SIG COM and the
backpanel signal ground can be made via R
100 ohms is a recommended value. Jumper J3 can be used to connect the SNS
LO line to R
For full protection against large electrical disturbances on the field-side of the
SCM5B modules, a #10-32 ground stud is provided on the backpanel. An
electrical connection between this ground stud and system ground should be
provided with a large gauge wire of the shortest possible length. When this
connection is made, a possible ground loop could result through the SIG COM
shield wires and backpanel signal ground. If the application involves only input
modules and a differential input is used by the host measurement system, J1
should be removed. Remember that J1 is required if output modules are used
or if the host system does not have differential inputs.
when cost savings is desired and thermocouple input modules
SCM5B37 snd SCM5B47 will not be used.
is mounted on a piece of anodized aluminum, which is captured
by the SCMXBEFE DIN rail mounting elements. The backpanel
is shipped fully assembled.
and SCMPB02-2 for details.
. R1 can be as large as 10K ohms;
1
when this ground configuration is used.
1
SCM5B
Grounding
Figure 7 below details the optional ground jumper configuration available on
the SCMPB02 backpanel. Jumpers J1, J2, and J4 are factory installed.
Jumper J1 connects the SIG COM shield wires (pins 2, 5, and 6) to the backpanel
signal ground. This provides a ground connection between the host system and
backpanel. Jumper J1 is required if output modules (SCM5B39, SCM5B49) are
used, or if there is no high impedance sense input (input low of a differential or
pseudo-differential system) on the host measurement system.
Jumper J2 connects the SNS LO line (pin 4) to the backpanel signal ground.
If the host system has the capability, this allows measuring the SCMPB02
ground potential.
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Figure 7: SCMPB02 Grounding Diagram
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