Installation manual
CNC 8055
CNC 8055i
LOGIC CNC INPUTS AND OUTPUTS
12.
SOFT: V02.2X
·493·
General logic inputs
TOOLINSP (M5050)
The CNC takes into consideration this input in MC, MCO, TC and TCO modes.
It indicates whether the "T" key must be pressed or not after executing the operation or the part in
order to inspect the tool.
TOOLINSP = 0 The tool inspection mode is available when interrupting the execution.
TOOLINSP = 1 To access the tool inspection mode, first interrupt the execution and then
press the "T" key.
RETRACE (M5051)
The CNC takes into account this input when retracing is available, general parameter RETRACAC
other than zero. The retracing function may also be activated while function G51 (look-ahead) is
active.
If while executing a part-program the PLC sets this signal high, retracing is activated. The CNC stops
the execution of the program and starts executing backwards the blocks executed until then.
When the PLC sets this signal back low, it cancels the retrace function. The CNC will resume forward
execution of the blocks that it executed backwards and goes on to the part of the program that had
not machined.
Retracing executes backwards the current block plus the last blocks that were already executed.
The retracing function ends in the following cases:
• When the previous 2000 blocks are retraced.
• When retraced all the way to the beginning of the program.
• When retracing up to block G51 (activating the look-ahead function).
• When finding a block that contains an M function (only if RETRACAC = 1).
• When finding a block that contains an S or a T function.
• When finding a high-level language block.
In all cases, the CNC activates the RETRAEND (M5522) signal to let the PLC know that all possible
blocks have been executed.
While the retracing function is active, neither tool inspection nor MDI operations are possible.
The Retracing function cannot be activated while a canned cycle is active.
ACTLIM2 (M5052)
The PLC sets this signal high to "tell" to the CNC to activate the second travel limits set by means
of variables LIMPL(X-C) and LIMMI(X-C).
The second travel limit of each axis will be taken into account if the first one has been set using axis
parameters LIMIT+ (P5) and LIMIT- (P6).
HNLINARC (M5053)
This signal is used when either the "path handwheel" or "path jog" work mode has been selected
using general input "MASTRHND (M5054)". It allows selecting the type of movement.
M5053 = 0 Linear path.
M5053 = 1 Arc path.
For a linear path, the path angle must be indicated by the MASLAN variable and for an arc, the center
coordinates must be indicated by the MASCFI and MASCSE variables
Variables MASLAN, MASCFI and MASCSE may be read and written from the CNC, DNC and PLC.
MASTRHND (M5054)
The PLC sets this signal high to "tell" the CNC to activate the "path handwheel" or the "path jog"
mode.
M5054 = 0 Normal work mode with handwheels or jog keys.
When working with G51 active, it must be borne in mind several blocks may go by from the moment
the RETRACE mark is activated until the machine starts retracing. Besides,the look-ahead
calculations will be different when going in one direction and returning; therefore, both paths might
not be exactly the same.
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