Revisions: IC660TBA106A , IC660TBA106B , IC660TBA106C , IC660TBA106D , IC660TBA106E , IC660TBA106F , IC660TBA106G , IC660TBA106H , IC660TBA106I , IC660TBA106J , IC660TBA106K , IC660TBA106L , IC660TBA106M , IC660TBA106N , IC660TBA106O , IC660TBA106P , IC660TBA106Q , IC660TBA106R , IC660TBA106S , IC660TBA106T , IC660TBA106U , IC660TBA106V , IC660TBA106W , IC660TBA106X , IC660TBA106Y , IC660TBA106Z ,
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Current-source Analog Input Blocks are used to interface a controller to devices that provide 4mA to 20mA analog signal. Current-source Analog Input Blocks are available with two types of block power supply: 115VAC/125VDC Current-source Analog Input block (IC660BBA106) 24/48VDC Current-source Analog Input block (IC660BBA026). The two blocks are the same in all other respects. Features A Current-source Analog Input block has six 4 to 20mA current inputs. Each input provides a 24 volt current loop power supply and is isolated from all other circuits within the block. The BSM circuitry is electrically common to Input 1, but isolated from the other inputs. A dedicated digital output is provided to drive a Bus Switching Module when a Current-source Analog Input block is installed in a redundant bus cable system. Additional configurable features include: Circuit scaling to engineering units values. CPU redundancy. Input conversion time. Fault reporting can be enabled or disabled circuit by circuit. These blocks automatically perform the following diagnostic checks: Input low and high alarms Input overrange and underrange Input current below 2mA Compatibility Current-source Analog Input blocks require a phase B Hand held Monitor (IC660HHM501H, version 4.5 or later) for configuration. For a Series 90 70 PLC, the programming software must be version 3.0 or later. Genius bus controller IC697BEM731C or later is required. For a Series Six PLC, the CPU must be rev. 105 or later. For a Series Six Plus PLC, rev. 110 or later is required. The programming software must be Logicmaster 6 rel. 4.02 or later. These blocks are compatible with bus controllers identified by catalog numbers IC660CCBB902 and 903. They are not compatible with bus controllers IC660CBB900 and 901. For a Series Five PLC, the CPU must be rev. 3.0 or later. The Logicmaster 5 programming software must be rel. 2.01 or later. A Bus Switching Module must be the 24/48 VDC version (IC660BSM021) only. 13 13-2 Genius I/O Discrete and Analog Blocks User s Manual September 1993 GEK-90486D-2 Specifications Block Type: Catalog Numbers: 115 VAC/125 VDC Current Source Input block Terminal Assembly Only Electronics Assembly Only 24/48 VDC Current Source Input block Terminal Assembly Only Electronics Assembly Only Each input circuit has a 24 volt current loop power supply, capable of providing 25mA of current. Each input is isolated from all other circuits on the block. Input accuracy is 0.1%. Input conversion time can be selected to provide the appropriate combination of noise rejection and input resolution. Conversion times are programmable from 16mS to 400mS. Resolution increases as the conversion time is lengthened. Input resolution is 1mA for 200mS conversion time. Upper and lower alarm limits can be programmed for each input circuit. If either limit is exceeded, the block indicates a fault and sends a message to the Hand held Monitor and CPU. Input Excitation Current The following illustration shows the input excitation current derating versus temperature. The maximum excitation current per channel is 25mA. 0 10 20 30 40 50 60 30 60 90 120 70 150 temperature in degrees C maximum excitation current per block in milliAmps 13 13-4 Genius I/O Discrete and Analog Blocks User s Manual September 1993 GEK-90486D-2 Input Data Format Each bus scan, a Current-source Input block broadcasts 12 bytes of input data. Each input consists of 2 bytes of data in the configured units. Appendix B shows reference usage for a Series 90, Series Six, or Series Five PLC. Byte # Hand held Monitor Input Display Inputs are reported as whole integers. For example, if the current value of an input was 25.36, it could be reported as: 25 engineering units, or 253 tenths of units, or 2536 hundredths of units Input values are displayed on the Monitor Block screen as shown at left. Individual inputs are also displayed in the Monitor/Control Reference screens. Diagnostics The block s advanced diagnostics provide the messages listed below. Fault messages can be cleared from the Hand held Monitor or the CPU. Input Open Wire: Input current is below 2mA. Input High Alarm: Input above high alarm level. Input Low Alarm: Input below low alarm level. Input Overrange: Signal exceeds 25mA. Input Underrange: Current is negative, or 0mA. REF 97 120 I I1: 253 I2: 186 > GEK-90486D-2 Chapter 13 Current-source Analog 6-Input Blocks 13-5 Field Wiring Terminals 5 through 32 are used for input power, Bus Switching Module control, and field wiring devices. These terminals accept AWG #22 to AWG #14 wires. Do not overtorque the terminal screws. The ground (GND) terminal (5) is for block safety. It is connected to the block chassis, and to terminals 13, 20, 24, 28, and 32. These terminals, which are marked GND, are for shield termination, if desired. Power Source Wiring For block power, connect an appropriate power source to terminals 6 and 7. For AC block power, connect the source to the H terminal and neutral to the N terminal. For DC block power, connect the source to the DC+ terminal and the return to the DC terminal. Self powered or externally powered transmitters are wired differently from those powered by the block. Wiring for I/O Devices Typical wiring for various configurations is shown at right. Connection of an optional Bus Switching Module is also shown. Connecting a Bus Switching Module to a CSI Block When a Bus Switching Module is installed, connect the BSM control wires to terminals 8 and 9. The polarity from the block is as marked; the BSM is insensitive to polarity. 13 13-6 Genius I/O Discrete and Analog Blocks User s Manual September 1993 GEK-90486D-2 Block Configuration The configurable features of a Current source Analog Input Block are listed below. For many, the factory setting may not need to be changed. Feature Features marked with an asterisk in the table are configured from the Program Block ID screen of the Hand held Monitor, as explained in chapter 3. The rest of the features can be configured either using a Hand held Monitor, or by sending a Write Configuration datagram to the block from the host. Before configuration begins, the features of each Current source Analog Input Block should be decided upon, then recorded on a copy of the Configuration Worksheet printed on the next page. |
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