AllenBradley Rockwell PLC module 1756-IF8

AllenBradley Rockwell PLC module 1756-IF8

Technical data of product parameters

The definitions of1756-IF8 , SV, TV, and QV are found in the user’s manual
for the field device supplied by the device manufacturer. The standard
format of these four variables is IEEE 794, a floating-point format.
You must configure IO point records to cause the Controller to scan the 1756-IF8
module and retrieve the variables. Refer to the “Point Builder User
Guide” (U3-1041) or “Ovation Developer Studio” (NT-0060) or
(WIN60) for additional information.
Bits 8-F: In the IO configuration tool, you can set these flags on a per-channel basis to allow HART messaging, including Multivariable messaging, to 1756-IF8
flow on that channel.
You should ensure that these bits are cleared for non-HART field devices. To avoid a HART communication error message, set each bit at “0”
when connecting a non-HART output device.After module configuration, the bank of eight channel LEDs (LEDs 1
through 8) is used to indicate HART communication activity. When a HART
message is sent, the LED for that particular channel is illuminated. When the
HART response is received correctly, the LED is extinguished. Therefore,
when all is normal, that is, messages and responses are properly exchanged,
a single LED blink will be observed on the module’s front cap.
If a HART message is sent and no response is received, the HART Analog
Output 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 Output module sent a HART 1756-IF8
message to a device on channel 2, but the device was not connected to
channel 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.

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