Tormach PCNC 440 - 7.2.7.3 Error Handling; 7.2.7.4 Modality and Modal Commands; 7.2.7.5 Modal Groups

Chapter 7
106
UM10372_PCNC440_Manual_0221A
PROgRAMMiNg
7.2.7.3 Error Handling
This secon describes error handling in PathPilot. This operang system somemes ignores things
it does not understand. If a command does not work as expected or does nothing, check if it was
typed correctly. The operang system does not check for excessively high-machining feeds or
speeds. Nor does it detect situaons where a legal command does something unfortunate, such as
machining a xture.
7.2.7.4 Modality and Modal Commands
G-codes and M-codes are, generally speaking, modal. Modal commands cause the machining
system to change from one mode to another. The mode stays acve unl another command changes
it implicitly or explicitly. For example, if coolant is turned on (M07 or M08) it stays on unl it is
explicitly turned o in the program (M09). A few G-codes and M-codes are non-modal. These codes
have eect only on the lines on which they occur. For example, dwell (G04) is non-modal.
7.2.7.5 Modal Groups
Modal commands are arranged in sets called modal groups, and only one member of a modal group
may be in force at any given me. In general, a modal group contains commands for which it is
logically impossible for two members to be in eect at the same me – for example inch units (G20)
vs. millimeter units (G21). A machining system may be in many modes at the same me, with one
mode from each modal group being in eect.
Modal Groups for G-codes
Group 1 = {G00, G01, G02, G03, G33, G38.x, G73, G76, G80, G81, G82, G85, G86, G87, G88, G89} moon
Group 2 = {G17, G18, G19, G17.1, G17.2, G17.3} plane selecon
Group 3 = {G90, G91} distance mode
Group 4 = {G90.1, G91.1} arc IJK distance mode
Group 5 = {G93, G94} feed rate mode
Group 6 = {G20, G21} units
Group 7 = {G40, G41, G42, G41.1, G42.1} cuer radius compensaon
Group 8 = {G43, G43.1, G49} tool length oset
Group 10 = {G98, G99} return mode in canned cycles
Group 12 = {G54, G55, G56, G57, G58, G59, G59.1, G59.2, G59.3} coordinate system selecon
Group 13 = {G61, G61.1, G64} path control mode
Group 14 = {G96, G97} spindle speed mode
Group 15 = {G07, G08} lathe diameter mode