Product Introduction
IMDSI22 is a digital input module produced by ABB, mainly used in ABB's INFI 90 distributed control system. The module can receive digital signals from field devices, such as switch quantity, relay status, limit switch, proximity sensor, etc., and convert them into digital signals that can be recognized by PLC (Programmable Logic Controller) or DCS (Distributed Control System).
Technical Specifications
|
Brand |
ABB Bailey |
|
Model |
IMDSI22 |
|
Part Number |
IMDSI22 |
|
Description |
16-Channel Digital Input Module |
|
Origin |
USA |
|
Dimension |
36*28*8cm |
|
Weight |
0.56kg |
Product Details
Module Description
The digital input module consists of a single printed circuit board that occupies one slot in a module mounting unit. It monitors two separate groups of eight digital inputs. Twelve inputs are isolated from each other; the remaining two pairs share common positive input lines.
Two captive screws on the module faceplate secure it to the module mounting unit. Sixteen front panel LED status indicators (group A and group B) display the input status and provide aid in system test and diagnosis.
The digital input module has three card edge connectors for external signals and power (P1, P2 and P3). P1 connects to common (ground) and +5 VDC power. P2 connects the module to the I/O expander bus to communicate with a controller. P3 inputs the digital signals using a cable connected to a termination unit. The terminal blocks (physical connection points) for field wiring are on the termination unit.
Inputs
Digital field inputs are voltages of 120 VAC, 24 VDC, 48 VDC, or 125 VDC. These voltages indicate an energized (on) field device; a zero volt input indicates a de-energized (off) field device. The DSI modules have a fixed input debounce filter for DC inputs to allow for contact debounce time (17 millisecond response time).
The IMDSI13 (24 VDC), the IMDSI14 (48 VDC), modules have fixed configurations and do not require any jumper selections. The IMDSI22 (120 VAC, 24VDC, 48VDC, or 125 VDC) module has jumpers to select the working voltage.
NOTE: Due to the number of pins on the P3 connector, 12 inputs are separate while the remaining two pairs share input terminals. The positive (+) side of point seven and eight are tied together in each group. These points must use the same contact voltage (120 VAC, 24 VDC, 48 VDC, or 125 VDC) set by the jumpers on the IMDSI22 module, or according to the relevant modules working voltage.
Input Circuits
Figure 2-1 is a block diagram illustrating signal flow through the module. The input isolation block consists of current limiters and optocouplers to isolate the 16 field inputs from the module circuitry. The input circuits provide 1500 VDC isolation between input and logic circuitry and other input channels.
Digital input high impedance provides additional (passive) protection from high energy transients of field digital inputs.
Input signal path and low isolation capacitance allow protection against fast transient-burst disturbance.
The threshold detection block circuits test the input voltage to determine if it is at the proper voltage level to indicate an (on) or (off) state. The output of this comparator is sent to a read buffer in the control logic block. If an input is energized, it also causes a corresponding input status LED on the front panel to light.
The control logic block consists of buffers that hold the input and status byte values. The I/O expander bus interface allows the controller to read these bytes.
Module Layout
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