PL_STATUS_B
reason = inpw(PLC(np,PL_STATUS_B)) & PL_BREAK_REASON ;
switch (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_STATE) {
switch (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_STATE) {
if (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL) {
if (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL) {
if (!(inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL))
!(inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL))