1771-OFE1 1771OFE1 AB AB Analog Output Module

1771-OFE1 1771OFE1 AB AB Analog Output Module

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Product Details

The AB 1771-OFE1 is a PLC 5 analog output module. It is a voltage version which converts 12-bit binary or 4-digit BCD (binary-coded decimal) values to analog signals using its 4 outputs. It has three selectable voltage ranges of 1 – 5V DC, 0 – 10V DC, and ±10V DC. Peripheral devices such as motor speed controllers, valve positioners, recorders, or signal converters can be connected to the output. The 1771-OFE1 uses block transfer programming for data transfer. Write Block Transfer instructions move data up to 13 words away from the processor to the module for DA conversion in one scan and Read Block Transfer moves 5 words of data from the module to the processor as part of the debugging process.

The 1771-OFE1 module has 4 1000V individually-isolated differential outputs. It requires a power of 1.4A at 5V which is supplied from the I/O chassis backplane thus no external power supply is needed. It has a channel update time of 8ms per 4 channels for BCD and 1.6ms per 4 channels for Natural Binary. It has a maximum power dissipation of 7.9W and maximum thermal dissipation of 26.9 BTU/hr. The 1771-OFE1 includes a wiring arm to replace the module without disconnecting the wires. It can be installed in any slot in a 1771 I/O chassis and keying bands must be snapped between 10-12 and 26-28 for fixing that slot.

The 1771-OFE1 module can convert raw data to engineering and measurement units such as °C, °F, gallons/minute, and pounds/square inch. For diagnostics, it performs a self-check at start-up. If a fault occurs, a red fault indicator LED and the green power status indicator LED remains OFF. The 1771-OFE1 has a 1500V optoelectrical isolation and this protects the system from overvoltage situation.

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