Fail safe on shutdown?

[celestinjr]

What is the intended response when the Pi shuts down but power is not lost to the Pi stack?

What about if either or both of the njsPC/REM processes hang or are stopped?

When issuing “sudo shutdown -h now”, I expected relays to go to their normal (unenergized) state, but my 8-relay hat controlled filter pump continues running.

Thanks!

[tagyoureit]

Many of the pumps will continue to run for a period of time (I believe a minute) without comms. They won't stop running immediately. Try the test again and watch the pump for a few minutes and it may shut off on it's own when it decides to get bored because it has no one else to talk to.

[celestinjr]

I’m running a single speed pump off of Relay8 relay -> 3hp relay.

The relay on the Relay8 card stays energized after shutting down the Pi. I expected it would revert to the NO status.

[celestinjr]

Finally got a chance to test this morning. I issued "sudo shutdown -h now" and waited about 30 minutes. My Relay8->3HP relay controlled pump stayed running the entire time.

[celestinjr]

I must have something botched in the REM configuration, or I’m misunderstanding something.

Trying to narrow this down, I issued “pm2 stop REM” with my pump running via NO relay #7 on the Relay8 card. The relay remains energized, and the pump runs indefinitely.

Upon restarting REM, the pump stops per the REM “Relay Off” startup state setting, until njsPC restarts it per schedule.

The following is the REM (silly) log output. Nothing jumps out to me.

[16/06/2024, 13:57:05] info: Closing 6 devices.
[16/06/2024, 13:57:05] info: Stopped Generic Device 1: CPU Temperature
[16/06/2024, 13:57:05] info: Stopped Generic Device 2: Water Temp Probe
[16/06/2024, 13:57:05] info: Stopped Generic Device 3: Heater Out Temp Probe
[16/06/2024, 13:57:05] info: Stopped Generic Device 4: Air Temp Probe
[16/06/2024, 13:57:05] info: Stopped Generic Device 5: Filter Inlet Pressure
[16/06/2024, 13:57:05] info: Stopped Generic Device 6: Case Temp Probe
[16/06/2024, 13:57:05] info: Closed Generic Devices
[16/06/2024, 13:57:05] info: Closing 2 i2c devices.
[16/06/2024, 13:57:05] info: Stopped I2c Sequent MEGA-BAS
[16/06/2024, 13:57:05] info: Stopped I2c Multi-Relay Board
[16/06/2024, 13:57:05] debug: 39 - Multi-Relay Board Executed read command 0x03 byte read:0x00
[16/06/2024, 13:57:05] info: Closed i2c Bus #1
[16/06/2024, 13:57:05] info: Stopping GPIO Controller
[16/06/2024, 13:57:05] debug: Persisting Configuration data... /home/carey/relayEquipmentManager/data/controllerConfig.json```

[rstrouse]

I'll have a look at this. I suspect that the newer relay 8 cards do not release the latch unless power is lost.