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SCM5BP

Analog Backpanels

SCM5BP image

SCMPB01 - 16-Position Analog I/O Backpanel, Non-Multiplexed


The SCMPB01 16-channel backpanel 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 it’s 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 module’s output to an output module’s 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 in pdf 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.

Connector P1 and P2
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 in pdf.

Example: Assume an SCM5B30 input module is installed in Channel 0 position and an SCM5B39 output module is installed in Channel 1 position. If JP1 is installed, the output of Channel 0 is connected to the input of Channel 1, which provides two levels of 1500 V isolation.

Power
The SCMPB01 backpanel requires external + 5 VDC ± 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 Littelfuse 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
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. 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.

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 R1. R1 can be as large as 10K ohms; 100 ohms is a recommended value. Jumper J2 can be used to connect the SENSE line to R1 when this ground configuration is used.

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.


SCMPB02 - 16-Position Analog I/O Backpanel, Multiplexed


The SCMPB02 16-channel backpanel 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 in pdf 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.

Connector P1
The 26 pin P1 and P2 connectors provide 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.

Adress 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.




To connect multiple SCMPB02 backpanels in this expanded configuration, use interconnect cable SCMXCA004-XX.

Modules with system output of ± 10 V or 0-10 V cannot be mixed with modules with system output of ± 5 V or 0-5 V within a given system.

Power
The SCMPB02 backpanel requires external + 5 VDC ± 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 Littelfuse 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
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.

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.

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 R1. R1 can be as large as 10K ohms; 100 ohms is a recommended value. Jumper J3 can be used to connect the SNS LO line to R1 when this ground configuration is used.

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.





SCMPB03/SCMPB04 - One/Two Position Analog I/O Backpanels


The SCMPB03 and SCMPB04 are single and dual channel mounting panels for the SCM5B modules. Both are intended for DIN rail mounting.

See Figures 9 and 10 for wiring diagrams, Figure 11 for schematic in pdf.




SCMPB05 - 8-Position Analog I/O Backpanel, Non-Multiplexed


The SCMPB05 backpanel (Figure 12) can accept up to eight SCM5B analog input and/or output modules in any combination. It can be mounted on the SCMXRK-002 19-inch metal rack. A separate analog signal path is provided for each channel and each channel’s signal is accessible at redundant 26-pin connectors. The module output switch is continuously “on” when using this backpanel and all eight module outputs are simultaneously accessible to high-speed data acquistion (ADC) boards.

On-board jumpers permit paralleling two SCMPB05 boards to form a SCMPB01 equivalent. An additional set of inter-channel bridge jumpers permits connecting an input module’s output to an output module’s input, providing two levels of isolation (Figures 12, 13 in pdf).

Jumpers on the SCMPB05 permit user selection of low (i.e. channels 0-7) or high (i.e. channels 8-15) addresses.

A temperature sensor mounted on each channel provides cold junction compensation for thermocouple input modules (see Fig. 13 in pdf 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.

Adress Selection
Module addresses may be selected as low (channels 0-7) or high (channels 8-15) using the sets of 3 pins labeled J5 through J12. Place a jumper over the two pins closest to the ribbon cable connectors, P1 and P2, to select a low address (factory configuration) or over the two pins furthest from the ribbon cable connectors, P1 and P2, to select a high address.

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 seven jumpers labeled JP1–JP7. See page 57 for an example. Refer to page 50 for additional notes on the P1 and P2 connectors, power requirements, fusing and grounding issues.




SCMPB06 - 8-Position Analog I/O Backpanel, Multiplexed


The SCMPB06 backpanel (Figure 14) can accept up to eight SCM5B modules in any combination. It can be mounted on the SCMXRK-002 19-inch metal rack. The SCMPB06 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 15 for schematic). Field connections are terminated with four screw terminals at each module site. Up to eight SCMPB06 backpanels may be daisy-chained. Use SCMXCA004-XX cable for daisy chaining and connecting to host computer.

Jumpers on the SCMPB06 permit user selection of low (i.e. channels 0-7) or high (i.e. channels 8-15) addresses.

Adress Selection
Module read and write addresses may be selected as low (channels 0-7) or high (channels 8-15) using the four sets of 3 position jumpers labeled J5 through J8. Place a jumper over the two pins furthest from the field I/O termination blocks on all four sets to select a low address (factory configuration) or over the two pins closest to the field I/O termination blocks on all four sets to select a high address.

The SCMPB06 backpanel has address decoding circuitry to allow multiplexing any combination of up to 8 input or output modules. Capability is also provided in the address decode circuitry to expand the system to 64 channels (eight SCMPB06 backpanels) of multiplexed input or output. Jumpers select which set of 16 addresses are assigned to a particular backpanel. The Read Address group assigns a set of 16 addresses for input modules, and the Write Address group assigns a set of 16 addresses for output modules. The table on the next page shows the correlation of jumper position to address range. Refer to page 53 for additional notes on the P1 and P4 connectors, power requirements, fusing, and grounding issues.

Modules with system output of ± 10 V or 0-10 V cannot be mixed with modules with system output of ± 5 V or 0-5 V within a given system.



SCMPB07 - 8-Position Backpanel, High Density


Die SCMPB07 8-Kanal HD-Trägerplatine kann The SCMPB07 8-channel high-density backpanel can accept any of the SCM5B analog modules in any mixture. Its overall width is 5.5 inches (139.7mm) versus 10 inches (254mm) for the SCMPB05 and SCMPB06 8-channel backpanels. Separate analog signal paths are provided for each channel. Each channel provides four high-density screw terminals for field connections and two high-density screw terminals for host system connection. It also provides a jumper on each channel to optionally connect or isolate each module’s I/O common from other channel's I/O common and/or power common (Figure 16 in pdf).

See Figure 11 on page 55 in pdf for schematic.

SCMPB07 and SCMPB07-1 can be upgraded to DIN rail mounting. The following accessories are required for mounting one SCMPB07 or one SCMPB07-1 backpanel (for a visual example, reference in pdf SCMPB03/SCMPB04 page 54, Figure 8):





PDF Downloads:


7 Modules for Type SCM5BP:

ModuleInputDescription
SCMPB01 16-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB02 16-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB03 1-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB04 2-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB05 8-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB06 8-Channel Backpanel SCMPB Backpanels for SCM5B-Modules
SCMPB07 8-Channel Backpanel SCMPB Backpanels for SCM5B-Modules

Specifications

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  • 1-, 2-, 8- and 16-Channel Backplanes with and without standoffs
  • 19" Metal Mounting Rack for Backpanels
  • Multiplexed and non-multiplexed backpanels
  • Input via screw clamps
  • Output via screw clamps or cable (depends on the backpanel)
  • Power supply 5 Volt
  • Operating temperature range -40°C … +85°C