4-14
Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-03 Rev. B
Channel Hard Fault Bit
In the case where one of the HART modem CPUs cannot be communicated with,
the channel is placed in a Hard Fault Mode. The HF bit is set for that channel and
the main processor will continue to try and establish communications with it.
This action may or may not disable the output since the reset line runs through
the same isolation IC as TX and RX. The channel status LED is set to blinking
Red while the Module Status LED will remain in its previous state. The other
channel is allowed to operate normally. In the case where 24 V user power is
lost, this same condition will occur for both channels since the HART modems
would not be powered and have no communications with the main MCU. Once
communication is restored with the channel, it will continue to operate with its
previous settings. The HF bit will be cleared and the LED returns to its previous
state.
Watchdog Fault
In the case where the main CPU experiences a watchdog failure, the following
will take place:
1.
The module resets.
2.
Once the watchdog reset is detected at startup, both channels are held in
reset.
3.
The Module Status is set to 1.
4.
Both Channel Statuses are set to the HF bit.
5.
The Module Status LED blinks Red, and Channel Status LEDs are solid
Red.
6.
Any configuration sent to the module is ignored.
7.
Firmware updates are allowed when in this state.
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Страница 13: ...Chapter 1 Module Overview 1 7 User s Manual Pub 0300272 03 Rev B See the block diagram below ...
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Страница 36: ...3 12 Chapter 3 Configuring the Module User s Manual Pub 0300272 03 Rev B ...
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Страница 74: ...A 6 Appendix A Module Specifications User s Manual Pub 0300272 03 Rev B ...
Страница 76: ...I 2 Index User s Manual Pub 0300272 03 Rev B ...
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