ALLEN BRADLEY 1756-PA72C Memory input to processor

ALLEN BRADLEY 1756-PA72C Memory input to processor

Technical data of product parameters

If a 1756-PA72C message is sent and no response is received, the HART Analog
Input module exclusive-OR’s the channel LED display with hex code 0xFF.
This results in all channel LEDs being illuminated except for the selected
channel. For example, if the HART Analog Input module sent a HART
message to device on channel 2, but the device was not connected to channel 1756-PA72C
2, the module would first illuminate LED 2 (all seven other channel LEDs
extinguished). The module would then extinguish LED 2 and flash the other
seven channel LEDs. This status indicates that the module sent a HART
message on channel 2 and did not receive a valid response message after the
initial message attempt or after any of the subsequent message retries.The Ovation HART Analog Output Module consists of an electronic module and a
personality mode. The Ovation HART Analog Output Module is designed to
interface with eight HART compliant output devices utilizing a 4-20 mA control 1756-PA72C
loop signal. A HART compliant output device will exchange digital information
with the Ovation control system in addition to the standard 4-20 mA control loop
signal. The digital information is imposed on the 4-20 mA signal according to the
guidelines of the HART Protocol Specification. HART uses a low-level frequency 1756-PA72C
shift-keyed sine-wave signal that is superimposed on the 4-20 mA signal. The
average value of the HART signal is zero. Therefore, the HART signal does not
interfere with the 4-20 mA control signal.There is one Electronics module group for the HART Analog Output Module:
• 5X00062G01 contains eight multiplexed, 4-20 mA output channels that
interface with 8 HART output devices.

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