IS200DTAIH1ABB IS210DTAOH1AA Gas turbine module

Current limiters and optocouplers in the isolation block isolate the three field inputs from the module circuitry. The threshold detection block circuits test the input voltage to determine if it is at the proper voltage level to indicate an energized (closed) or de-energized (open) state for the field device. These values are sent to the digital I/O buffer block. Jumpers on the CIS select the threshold detection voltage level.The output isolation block consists of optocouplers to isolate the control logic circuits from the process. Four open collector transistors that can sink a 250 mA load make up the driver block.The digital I/O buffer block is a buffer and register that hold the values of the digital inputs and outputs. The slave expander bus interface writes digital data to the register for output by the driver block circuits, and reads the digital input values from the buffer.

I/O CIRCUIT CONNECTIONS 

The I/O signals connect to the 30-pin card edge connector P3 of the CIS using a termination cable from a TU/TM. It also supplies +24 VDC power to operate the analog output circuits.The Infi 90 slave expander bus is a high speed synchronous parallel bus. It provides a communication path between master modules and slave modules. The master module provides the control functions and the slave module provides the I/O functions. The P2 card edge connector of the slave and master module connect to the bus.The slave expander bus is twelve 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 master and slave modules. Cable assemblies can extend the bus to six MMUs.

UNIVERSAL SLAVE EXPANDER BUS INTERFACE

 The CIS uses a custom gate array to perform the slave 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. A master module and its slaves form an individual subsystem within a Process Control Unit (PCU). The slave expander bus between master/slave subsystems must be separated. Leaving a dipshunt socket empty or not connecting the MMUs with cables separates them.

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