Issue with analog output during power on sequence before going into run mode

[opburg89]

Hi,
Having an issue with the BRX analog output configured for +-10vdc during an initial power on sequence.
The analog output controls a hydraulic proportional valve to move a cylinder into position. We are using the BX-DM1E-10ED23-D plc with local onboard analog
input and outputs. I have a 4-20ma LVDT connected to the analog input and a +-10vdc proportional valve connected to the analog output with 0vdc being no motion. Everything works properly
after unit is in run mode with LED run light solid. If the Run/Term/Prog switch is placed in program mode prior to removing plc power, the cylinder will not move during the initial startup sequence.
After the PLC goes through its startup sequence and the PWR light is illuminated solid, the switch can be placed into run and the hydraulic cylinder will not move. If the mode switch is left in run
or terminal position and power is cycled to plc then when power is re-applied and prior to the PLC going into run mode with the PWR light flashing the proportional valve will receive a -10vdc signal from the onboard analog
output, moving the cylinder in a negative direction until the plc fully boots up into run mode and run light is illuminated. Is there any way to disable the analog output during initial startup? I looked
within the Do-more software and online tech support without success. Could this be hardware/firmware related? Thanks for help or direction!
 

[BobO]

Would have to dig in a bit to see what might be happening. There certainly isn't any intentional move to the rail, but we'll need to study the reset state and see what's gong on.