Mitsubishi Melsec-L Series User Manual page 23

(3) Exchange of data with connected devices (communications using a fixed
buffer and random access buffer)
(a) Communications using a fixed buffer
Up to 1K-word data can be exchanged among programmable controllers or between a programmable
controller and the host system. While MC protocol communications are passive, communications using a fixed
buffer are an active protocol. If an error occurs in equipment or certain conditions are met, the programmable
controller can send data to the host system. Using an interrupt program allows the CPU module to quickly read
received data. (
Another station
(b) Communications using a random access buffer
Up to 6K-word data can be communicated. This buffer is useful when the data size is too large for
communications using a fixed buffer (capacity: 1K word). (
Connected device
(4) Prevention of unauthorized access through a remote password
This function prevents unauthorized remote access to the CPU module. The E71 checks an entered remote
password in data communications from a connected device using remote password-protected connection.
( Page 140, Section 12.3)
Page 87, CHAPTER 10)
Send/receive
Own station
Read/write
E71
Send/receive
Connected device
Page 120, CHAPTER 11)
Read/write
Connected device
CHAPTER 1 FEATURES
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