M54, M55, M56, M57 (General purpose IO)

20min

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Digital outputs
Set output - M54 P... 
The P word must be between 1 and 10 where 1 is AUX1 and 10 is AUX10. 
M54 P1  (set AUX1 out to 1)
If the connected controller only has one AUX output, 2 is mapped to FLOOD and 3 to MIST.
M54 P2  (set AUX2 out to 1 or FLOOD to 1 if the controller has 1 AUX)
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Clear output - M55 P...
Clear output. The P word must be between 1 and 10 where 1 is AUX1 and 10 is AUX10. 
M55 P1 (set AUX1 out to 0)
If the connected controller only has one AUX output, 2 is mapped to FLOOD and 3 to MIST.
M55 P2  (set AUX2 out to 0 or FLOAD to 0 if the controller has 1 AUX)
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Read outputs - M57 P
Read output x, store the result in variable #5399
M57 P...
Output
P value
AUX1-AUXn
1 to n
Machine On
51
Drive Enable
52
Coolant1 (Flood)
61
Coolant2 (Mist)
62
Tool
63
Tool direction
64
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Digital inputs
Read input - M56 P... 
P value 
Input
51 - 56
Home Inputs X-C
61
Probe Input
62
Sync Input
63
HWA Input
64
HWB Input
65
ESTOP1
66
ESTOP2
67
EXTERR
68
PAUSE
The result is stored in variable﻿  #5399
Example: erad AUX input 3:
M56 P3 (Read AUX in 3)
If [#5399 == 1]
   Msg "AUX3=ON"
Else
   Msg "AUX3=OFF"
endif
Example: read home-input of X axis:
M56 P51
If [#5399 == 1]
   Msg "HOME X=ON"
Else
   Msg "HOME X=OFF"
endif
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Read input + wait - M56 P ... L...  Q...
Read digital input P and specify wait mode, the result is stored in variable #5399
P...: the input number
L0: do not wait
L1: Wait for High
L2: Wait for Low
Q...: timeout (seconds)
M56 P3 L2 Q30 (Read AUX in 3)
If [#5399 == -1]
   Errmsg "Timeout while waiting for AUX3 becoming low"
Else
   Msg "AUX3 is off"
Endif
Note that we use wait (L2) here, in the event of a timeout, the value of #5399 is -1.
In order to make this code simulation and rendering proof we need to extend it like this:
If [[#5380 == 0] and [#5397 == 0]] ;;Check only if running job
   M56 P3 L2 Q30 (Read AUX in 3)
   If [#5399 == -1]
    Errmsg “Timeout while waiting for AUX3 becoming low”
  Else
    Msg “AUX3 is off”
  Endif
Endif 
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Analogue inputs
Read analog input - M56 E…
Read analog input E, result stored in #5399
M56 E3
Msg "analog value is " #5399
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PWM
Set PWM - M54 E... Q...
Set PWM output E to permille value Q (0 <= y <= 1000)
M54 E2 Q500 (Set PWM2 to 50% PWM)
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Read PWM output - M57 E...
Read PWM output, result stored in #5399
M57 E3
If [#5399 == 0]
   Msg "PWM IS OFF"
Else
   Msg "PWM IS ON, VALUE="#5399
endif
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Optional IOCARD
If a relay board is used such as RLY8, the IO number P or E is specified like in the following examples:
value of 103 means card 1 port 3
value of 208 means card 2 port 8
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Output	P value
AUX1-AUXn	1 to n
Machine On	51
Drive Enable	52
Coolant1 (Flood)	61
Coolant2 (Mist)	62
Tool	63
Tool direction	64

P value	Input
51 - 56	Home Inputs X-C
61	Probe Input
62	Sync Input
63	HWA Input
64	HWB Input
65	ESTOP1
66	ESTOP2
67	EXTERR
68	PAUSE

M48 - M53 (Feed-Speed Override Control)

M64, M65, M66, M67 (Phoenix Contact Axioline IO)