National Instruments FIeldPoint FP-AO-200 Скачать руководство пользователя страница 5 | Manualshive

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National Instruments FIeldPoint FP-AO-200 Скачать руководство пользователя страница 5

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Output Ranges

You may configure the output range of each channel independently
for either 0-20 mA or 4-20 mA operation. The factory default
power-up setting for each channel is 0-20 mA, with output set to
0 mA. The FP-AO-200 has a built in over-range capability of
0.5 mA in each of these ranges, thus the actual full scale ranges
available are 0-20.5 mA and 3.5-20.5 mA. This extended range
feature allows the FP-AO-200 to compensate for span and offset
errors in field devices.

Open Loop Detection

Each channel has a monitoring circuit which compares the actual
output current to the desired output current. If the FP-AO-200
cannot source the desired output current for one or more channels,
these monitoring circuits turn on a red STATUS LED for each
affected channel and report this error condition to the network
module. Generally, the cause for this error condition is an open
current loop—either the load device or the loop supply is
disconnected. However, this method or detection also catches
errors caused by a load impedance that is too high, or a loop supply
voltage that is too low, to provide the desired output current.

If the output of the an FP-AO-200 channel is set to 0 mA, the
monitoring circuit does not register an error condition because the
FP-AO-200 can always source zero current, even to an open loop.
So, if any channels are unused and left unwired they should be left
in the default state of 0 mA to prevent unnecessary (and possibly
annoying) error indications.

Short Circuit Protection

Each output terminal I

out

of the FP-AO-200 is protected against

short circuits to any of the other terminals. One or more channel
outputs can be short circuited indefinitely without causing damage
or improper operation of other channels, as long as the maximum
loop supply does not exceed 24 VDC. The outputs can withstand
indefinite short circuits with loop supplies of more than 24 VDC
(up to 36 VDC) without damage, but increasing internal
temperatures due to such conditions may cause improper operation
of other channels on the module.

FPAO200.fm Page 5 Thursday, July 31, 1997 8:55 AM

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Содержание FIeldPoint FP-AO-200

Страница 1: ...0 to 70 C operation Overview The FP AO 200 is a FieldPoint analog output module with eight 0 20 4 20 mA current loop outputs You can use the FP AO 200 to drive devices using process current loops of either the 0 20 mA or 4 20 mA standards Hot plug and play operation safety isolation onboard diagnostics such as open loop detection and over ranging ability ensure that installation and maintenance ar...

Страница 2: ...O 200 in the terminal base The terminal base latch locks the FP AO 200 into place when it is firmly seated 4 Connect a current loop supply for the outputs to the V and C terminals of the terminal base Figure 1 Module Installation Diagram Field Wiring The FP AO 200 sources current from an external loop supply to a load or field device The terminal base provides connections for both the external loo...

Страница 3: ...mentary power Figure 2 Basic Field Connections Two channels shown Table 1 lists the terminal assignments for the signals associated with each channel Table 1 Terminal Assignments Channel Terminal Numbers Iout COM Vsup 0 1 2 18 17 1 3 4 20 19 2 5 6 22 21 3 7 8 24 23 4 9 10 26 25 5 11 12 28 27 6 13 14 30 29 7 15 16 32 31 Loop Supply V C Load Iout COM Load Iout COM Loop Supply V Load Iout Load Iout a...

Страница 4: ...tects and reports error conditions due to excessive loads or insufficient loop supplies For more information refer to the Open Loop Detection section in this document The FP AO 200 updates the output channels as new values are sent to it by the network module The time it takes to respond to a change on a single channel is between 3 and 6 ms The response time to changes on all eight channels is 24 ...

Страница 5: ...nnected However this method or detection also catches errors caused by a load impedance that is too high or a loop supply voltage that is too low to provide the desired output current If the output of the an FP AO 200 channel is set to 0 mA the monitoring circuit does not register an error condition because the FP AO 200 can always source zero current even to an open loop So if any channels are un...

Страница 6: ...turns on and the FP AO 200 is in its normal operating mode In addition to the green POWER and READY indicators each channel has a red numbered error status indicator For more information refer to the section on Open Loop Detection in this document Isolation and Safety CAUTION Read the following information before attempting to connect ANY circuits which may contain hazardous voltages to the FP AO ...

Страница 7: ...t not between channels on the same module If any of the channels on a module are wired at a hazardous potential ensure that all other devices or circuits connected to that module are properly insulated from human contact Do not share the external loop supply voltages V and C on the terminal base with other devices including other FieldPoint devices unless those devices are also isolated from human...

Страница 8: ...ble 0 21 mA or 3 5 21 mA with over range Type Current source external loop power required External Loop Power 5 to 24 VDC Resistive load up to 1 kOhm with 24 V loop supply up to 100 Ohm with 5 V supply Voltage Drop 3 V Protection Short circuit and open circuit Default Power on state 0 mA Accuracy Absolute accuracy 0 2 FSR Monotonicity Guaranteed over temperature Offset temperature coefficient 50 n...

Страница 9: ...k Compliance This product meets applicable EU directive s as follows Safety isolation EN 61010 double insulation for 250 Vrms working isolation installation category II EMC Directive Immunity EN 50082 1 1994 Emissions EN 55011 1991 Group I Class A at 10 meters Mechanical Dimensions Figure 5 shows the mechanical dimensions of the FP AO 200 installed onto a terminal base Figure 5 Mechanical Dimensio...

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