IS230TBAIH2C gas turbine electric card

The status buffer block provides module status information to the control module. This information is output states, and module identification and status. The control module reads this data through the I/O expander bus interface. Refer to Output Control Logic in this section for an explanation of the data. OUTPUT CIRCUIT CONNECTIONS The output signals connect to the 30-pin card edge connector P3 of the DSO using a termination cable from a termination unit (TU) or a termination module (TM). Proper polarity wiring of field signals is necessary for the output circuits to function properly

Output data is two 8-bit bytes sent to the output registers. Each byte corresponds to group A and group B outputs. Each bit of data represents one output. The bit value reflects the state of the output. Logic 1 turns a field device ON; logic 0 turns it OFF.

I/O EXPANDER BUS

 The INFI 90 OPEN I/O expander bus is a high speed synchronous parallel bus. It provides a communication path between control modules and I/O modules. The control module provides the control functions and the I/O module provides the input/output functions. The P2 card edge connector of the I/O module and control module connect to the bus. The I/O expander bus is parallel signal lines located on the module mounting unit (MMU) backplane. A 12-position dipshunt placed in a connection socket on the MMU backplane connects the bus between the control and I/O modules. Cable assemblies can extend the bus to six MMUs. A control module and its I/O modules form an individual subsystem within a process control unit (PCU). The I/O expander bus between control and I/O subsystems must be separated. Leaving a dipshunt socket empty or not connecting the MMUs with cables separates them.

UNIVERSAL I/O EXPANDER BUS INTERFACE

 The DSO uses a custom gate array to perform the I/O expander bus interface function. All the control logic and communication protocol are built into an integrated circuit (IC). This IC provides the following functions: • Address comparison and detection. • Function code latching and decoding. • Read strobe generation. • Data line filtering of bus signals. • On-board bus drivers. MODULE DATA FC 83 in the control module configuration accesses the DSO on the I/O expander bus. It also allows the control module to automatically read status data from the I/O module, and write output data to it. The I/O module address in FC 83 must be the same as the address set on the I/O address dipswitch (S1).

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