Experimental Physics and
Industrial Control System

Ron Sluiter <[email protected]> · Thu, 10 Oct 2013 13:41:19 -0500

Eric Rod (APS) discovered last week that his two, rather new, OMS MAXv

boards were not responding to travel limits. OMS has confirmed that in

two versions of the MAXv firmware; 1.41 and 1.42, the default mode of

the limit switches after either a power-up or a reset is, off. In other

words, MAXv's with firmware versions 1.41 or 1.42 will, by default, not

stop moving a motor when a limit switch is activated.

You can determine the firmware version of your OMS MAXv's from the EPICS

iocsh by entering the command; dbior drvMAXv.

If you have MAXv's with firmware versions 1.41 or 1.42 you should

upgrade the firmware (MAXv's are field upgradable) as soon as possible.

Until then you should immediately change the MAXv initialization string

that is passed by the MAXvConfig() command by adding the Limit Mode

command "AA; LM,H,,H;". For example, change this string,

config0="AX LTL PSO; AY LTL PSO; AZ LTL PSO; AT LTL PSO; AU LTH PSO; AV

LTH PSO; AR LTH PSO; AS LTH PSO;"

to this,

config0="AA; LM,H,,H; AX LTL PSO; AY LTL PSO; AZ LTL PSO; AT LTL PSO; AU

LTH PSO; AV LTH PSO; AR LTH PSO; AS LTH PSO;"

Then reboot your system. The limit switches will now be configured for

"the Hard Limit mode, which causes the affected axis or axes to abruptly

halt when a limit condition is encountered."

Ron

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System