Mitsubishi Electric RD77MS16, User Manual

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2 HOME POSITION RETURN CONTROL
2.1 Outline of Home Position Return Control
When using an absolute position system
• This flag turns on in the following cases:
• This flag turns off by the completion of the machine home position return.
Wiring the near-point dog
The "external input signal of the Simple Motion module", "external input signal of the servo amplifier" or "buffer memory of the
Simple Motion module" can be selected by "[Pr.118] DOG signal selection" as the near-point dog.
When the "buffer memory of the Simple Motion module" is selected, the wiring differs according to the Input module used. As
for the 24 V DC power supply, the direction of current can be switched.
*1 When "Servo amplifier" is set in "[Pr.116] FLS signal selection" to "[Pr.118] DOG signal selection" at MR-JE-B use, any errors or
warnings do not occur. However, the external input signal (upper/lower limit signal, near-point dog signal) cannot be operated.
Home position return sub functions
Refer to the following for details on "sub functions" that can be combined with home position return control.

MELSEC iQ-R Simple Motion Module User's Manual (Startup)
Also refer to the following for details on each sub function.

Page 215 CONTROL SUB FUNCTIONS
[Remarks]
The following two sub functions are only related to machine home position return.

: Combination possible,

: Restricted,

: Combination not possible
When a home position return is not required
Control can be carried out ignoring the "home position return request flag" ([Md.31] Status: b3) in systems that do not require
a home position return.
In this case, the "home position return parameters ([Pr.43] to [Pr.57])" must all be set to their initial values or a value at which
an error does not occur.
• When not executing a machine home position return even once after the system starts
• Machine home position return start (Unless a machine home position return is completed normally, the home position return request flag does not turn off.)
• When an absolute position data in the Simple Motion module is erased due to a battery error, etc. (occurrence of the warning "Home position return data
incorrect" (warning code: 093CH))
• When the "Rotation direction selection/travel direction selection (PA14)" of servo parameter is changed.
• The servo alarm "Absolute position erased" (alarm No.: 25) occurs. ([Md.108] Servo status1: b14 ON)
• The servo warning "Absolute position counter warning" (warning No.: E3) occurs. ([Md.108] Servo status1: b14 ON)
n: Axis No. - 1
Sub function name Machine home position return Fast home position return Reference
Home position return retry function
  
Page 217 Home position return retry
function
Home position shift function
  
Page 221 Home position shift function
Monitor item Buffer memory address
[Md.108] Servo status1: b14 2477+100n
Simple Motion
module
DOG
COM
24 V DC
Servo amplifier
DI3
(DOG)
DICOM
24 V DC