Mitsubishi FX2N-10GM, Hardware / Programming Manual

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Communication with Programmable Controller 7
7-1
7. Communication with Programmable Controller
When the FX
2N
-10GM/FX
2N
-20GM positioning unit is connected to the FX
2N
/FX
2NC
Series pro-
grammable controller, positioning data such as the travel, the operation speed, etc., can be set
and the present position can be monitored. This section explains the communication with the
programmable controller to perform these operations.
7.1 Outline
Communication with the programmable controller is performed using the FROM/TO instruction
of the programmable controller via buffer memories (BFM) inside the positioning unit.
The schematic diagram below shows the communication between the programmable controller
and the positioning unit. (For system configuration, refer to Section 1.)
FROM instruction: Reads the contents of the BFM to the programmable controller.
TO instruction:
Writes the contents of the programmable controller to the BFM.
• Between the programmable controller and the buffer memories in the positioning unit, com-
munication is performed when the FROM or TO instruction in the sequence program is exe-
cuted. At this time, the positioning unit may be in the MANU or AUTO mode.
• The buffer memories interlock with the special M’s and the special D’s in the positioning
unit. When the contents of the buffer memories change, the contents of the special Ms and
the special D’s also change. The positioning unit automatically performs communication
between them.
FX
2N
,FX
2NC
series programmable controller FX
2N
-10GM,FX
2N
-20GM
Peripheral unit for
programmable controller Peripheral unit for
positioning unit
Program for
programmable controller
FROM instruction
TO instruction
Extension cable
Reading
Writing
Buffer
memory
(BFM)
16-bit
from #0. Special
auxiliary
relays (M).
Data
registers
(D).
E-20TP personal
computer, etc.
Parameters
Positioning
program
FX Series Positioning Controllers