User`s manual

235
CHAPTER 9 CONTENTS AND REGISTRATION OF THE USER FRAMES FOR DATA COMMUNICATION
9
9.3 Precautions when Registering, Reading, Deleting and Using User Frames
9.3 Precautions when Registering, Reading, Deleting and
Using User Frames
The following shows the precautions which should be observed when registering user frames and using registered
user frames to transmit data to and receive data correctly from the external device.
(1) Precautions when registering, reading or deleting user frames
(a) User frames can be registered using one of the following methods. However, an
user frame to be registered to the flash ROM could be registered by the utility
package (GX Configurator-SC) dedicated to the Q series C24 as much as possible.
• Registering via the utility package (GX Configurator-SC) for the Q series C24.
• Registering with the dedicated instruction "PUTE" from the programmable controller CPU.
• Registering from an external device with command "1610" through communication using the MC protocol.
(b) The following settings are required when registering or deleting user frames.
• Switch setting using GX Developer: Set the setting modification to Enable in the transmission setting.
• Settings via GX Configurator-SC: Set the flash ROM write allow/prohibit setting to Allow on the monitor/test
screen.
• To set from the programmable controller CPU, write "1" in the following buffer memory at the startup of the
Q series C24 (when the ready signal rises). Flash ROM write allow/prohibit designation area (address:
2000H)
(c) To register, read or delete user frames from the programmable controller CPU,
perform the operation while there is no data communication in progress with the
external device.
(d) An user frame having only a sum check code as changeable data cannot be
registered.
To register a sum check code, add arbitrary data.
(e) Register a receive user frame in the Q series C24 flash ROM.
(f) The changeable data (05H to F9H) can be specified at only one place in the last
frame.