FLEX Ex 8 Output and HART Analog Modules
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Publication
1797-IN003J-EN-P - August 2017
Analog Fault State
Value
Specifies the fault state value of the analog output data to the module.
Specific format is controlled by Module Data Format Control
parameter. This data is used when the channel is in Analog Output
mode and the analog fault state is configured to use analog fault state
value.
Digital Fault State
Determines how module reacts to faults when channel is used in
digital mode.
Range: 0 = reset, 1 = hold last state.
Fault Mode
Selects whether the channel pair fault detection is enabled or
disabled. There is a 100 Hz (10 ms) filter for wire-off/lead-break
detection.
Range: 0 = disable, 1 = wire-off fault detection enabled.
Latch Retry Mode
Latch Retry determines channel operation under wire-off fault
conditions. These bits control the action of two channel groups -
channels 0…3 and channels 4…7. When a channel fault occurs, the
channel fault alarm will be set (if enabled) and the safe state mode
will be enabled. If retry is selected, the channel will periodically try to
reestablish proper output. If latch is selected, the fault will be latched
until a Global Reset is issued.
Range: 0 = retry, 1 = latch.
Local Fault Mode
This parameter determines how the Module Safe State will be used
for bus communication and internal module faults. This parameter sets
this characteristic for the module.
Range: 0 = fault states activated by bus communication faults, 1 = fault
states activated by any failure (for example, bus communications).
Fault Alarm (8 or 1 Bit
Each)
Alarm signal for open wire channel fault, detected at < 2 mA. This
alarm is disabled when a data format is selected which includes 0 mA.
Range: 0 = normal, 1 = wire-off fault detected.
HART Rebuild Flag
(1 of 1 Bit)
(1797-OE8H)
During the time the system is rebuilding the HART table, the HART
rebuild flag is set.
Range: 0 = normal, 1 = HART rebuilding.
Field Descriptions