IS200DTAIH1ACC IS210DTAOH1AA Gas turbine module

Function Code (FC) 79 in the MFP configuration accesses the CIS on the slave expander bus. It also allows the MFP to automatically read input data or status data from the slave module, and write output data to it. This data is output by buffer circuits to the slave expander bus interface (see Figure 2-1). The slave address in FC 79 must be the same as the address set on the slave address dipswitch (S1).I/O data is analog input, digital input, and digital and analog output readback values that the MFP reads from the CIS. It is also analog and digital output values that the MFP sends to the CIS. The MFP uses this data to monitor and control a process, and verify CIS operation.

Analog input data consists of analog counts from the A/D converter.

 Analog counts are digital values that correspond to analog signals; the A/D performs the conversion. The signals converted include the four analog inputs, two reference voltages (1 VDC and 5 VDC) and two analog output readback values. The MFP reads each of these count values once every execution cycle. Each analog input count value corresponds to an analog input voltage. Reference voltage values are read by the MFP to verify A/D converter integrity. It reads the two analog output values to adjust the analog outputs and check for output circuit failures. The MFP reads a one byte value that consists of digital output readback values and digital input values. The digital input values indicate the digital input states. Each bit corresponds to one input; the bit value reflects the state of that input,either open (logic 0) or closed (logic 1). Digital output readback data reflects the output states. The MFP uses this data to verify that the outputs are correct. Each bit corresponds to one output; a logic 1 indicates an active (ON) output, a logic 0 indicates an inactive (OFF) output.

Status Data 

Status data is an 8-bit data value that identifies the slave module and indicates the default values set by the analog output default dipswitch (S2). The MFP reads the identification bits (four MSB) to verify the slave expander bus communication integrity and MFP configuration. It reads the default bits (four LSB) to determine the default states set for the analog outputs in the event of a time-out.Logic power (+5 VDC and ±15 VDC) drives the CIS circuits. It connects through the top 12-pin card edge connector (P1) shown in Figure 2-1. P3 supplies +24 VDC to operate the analog output circuits.

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