Proline Promass 83E/F/O Description of Device Functions - FMC ...

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7 Block OUTPUTS Device Functions Proline Promass 83 Function description OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (FREQUENCY) START VALUE FREQUENCY (4202) ! Note! This function is not available unless the FREQUENCY setting was selected in the OPERATION MODE function (4200). Use this function to define an initial frequency for the frequency output. You define the associated measured value of the measuring range in the VALUE F LOW function (4204) described on page 77. User input: 5-digit fixed-point number: 0...10000 Hz Factory setting: 0 Hz Example: • VALUE F LOW = 0 kg/h, initial frequency = 0 Hz: i.e. a frequency of 0 Hz is output at a flow of 0 kg/h. • VALUE F LOW = 1 kg/h, initial frequency = 10 Hz: i.e. a frequency of 10 Hz is output at a flow of 1 kg/h. END VALUE FREQUENCY (4203) ! Note! This function is not available unless the FREQUENCY setting was selected in the OPERATION MODE function (4200). Use this function to define a full scale frequency for the frequency output. You define the associated measured value of the measuring range in the VALUE F HIGH function (4205) described on page 77. User input: 5-digit fixed-point number 2...10000 Hz Factory setting: 10000 Hz Example: • VALUE F HIGH = 10000 kg/h, full scale frequency = 10000 Hz: i.e. a frequency of 10000 Hz is output at a flow of 10000 kg/h. • VALUE F HIGH = 3600 kg/h, full scale frequency = 10000 Hz: i.e. a frequency of 10000 Hz is output at a flow of 3600 kg/h. ! Note! In the FREQUENCY operating mode the output signal is symmetrical (on/off ratio = 1:1). At low frequencies the pulse duration is limited to a maximum of 2 seconds, i.e. the on/off ratio is no longer symmetrical. Page 76 • MN0M023 Issue/Rev. 0.2 (12/12)
Device Functions Proline Promass 83 7 Block OUTPUTS Function description OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (FREQUENCY) VALUE F LOW (4204) ! Note! This function is not available unless the FREQUENCY setting was selected in the OPERATION MODE function (4200). Use this function to assign a variable to the start value frequency (4202). The value can be higher or lower than the value assigned to the VALUE F HIGH. Positive and negative values are permissible, depending on the measured variable in question (e.g. mass flow). You define a measuring range by defining the VALUE F LOW and VALUE F HIGH values. User input: 5-digit floating-point number Factory setting: 0 [kg/h] or 0 [kg/l] or –50 [°C] ! Note! • For a graphic illustration VALUE F LOW see the VALUE F HIGH function (4205). • Note that values with different signs cannot be entered for VALUE F LOW and VALUE F HIGH, if SYMMETRY is the setting selected for the MEASURING MODE function (4206). In this case, the message “INPUT RANGE EXCEEDED” appears on the display. • The appropriate unit is taken from the UNIT MASS FLOW (0400), UNIT VOLUME FLOW (0402), UNIT CORRECTED VOLUME FLOW (0404), UNIT DENSITY (0420), UNIT REFERENCE DENSITY (0421) or UNIT TEMPERATURE (0422) function (see p. 17 to p. 21). VALUE F HIGH (4205) ! Note! This function is not available unless the FREQUENCY setting was selected in the OPERATION MODE function (4200). Use this function to assign a variable to the end value frequency (4203). The value can be higher or lower than the value assigned to the VALUE F LOW. Positive and negative values are permissible, depending on the measured variable in question (e.g. mass flow). You define a measuring range by defining the VALUE F LOW and VALUE F HIGH values. User input: 5-digit floating-point number Factory setting: Depends on nominal diameter [kg/h] or 2 [kg/l] or 200 [°C] ! Note! Note that values with different signs cannot be entered for VALUE F LOW and VALUE F HIGH, if SYMMETRY is the setting selected for the MEASURING MODE function (4206). In this case, the message “INPUT RANGE EXCEEDED” appears on the display. 125 100 Freq. 0 ➀ ➁ Q m = VALUE f min n = VALUE f max A0001279 (continued on next page) Issue/Rev. 0.2 (12/12) MN0M023 • Page 77
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