file BCAL_US_PLCin.req   IOC=${PREF}BCUS:i 
file BCAL_US_PLCout.req  IOC=${PREF}BCUS:o 
file BCAL_DS_PLCin.req   IOC=${PREF}BCDS:i 
file BCAL_DS_PLCout.req  IOC=${PREF}BCDS:o