ENK32 Analog features module

Accepts digital field inputs, and isolates the module circuitry from the process.Outputs digital signals to process field devices, and isolates the module circuitry from the process. The MFP communicates with its slave modules on a 12-line slave expander bus as shown in Figure 1-1. It references the address set by the slave address dipswitch (S1). Figure 2-1 is a block diagram of the CIS.The CIS can input four separate analog signals (1 to 5 VDC), and output two separate analog signals (1 to 5 VDC, 4 to 20 mA). The module accepts analog inputs that are either single ended or differential voltages. It allows for a common mode (inputs change together proportionally) differential voltage of ±10 VDC. The CIS output mode is selectable: current or voltage. Figure 2-2 shows the analog input and output circuits.

Analog Inputs 

The input conditioning block consists of two pole input filters that reduce input signal noise. They provide 76 db of normal mode rejection (differential change) and 90 db of common mode rejection for the differential inputs. The CIS uses analog voltage inputs only. Its respective Termination Unit (TU) or Termination Module (TM) is configurable for current or voltage inputs; resistors on the TU/TM convert analog current inputs to voltages that are sent to the CIS.

The input select block consists of an analog multiplexer and an inverting difference amplifier. The multiplexer selects one of the four inputs or the reference block inputs (calibration voltages). The difference amplifier converts the selected input to a single ended signal. The A/D converter block circuits change the input signal to a 12-bit value that is sent to the slave expander bus interface. This value is an analog count that corresponds to the input voltage. Nominal input range is 1 to 5 VDC, however, it allows for a 0.75 to 5.25 VDC input range which is ±6.25 percent of the nominal input range span (4 VDC).

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Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

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