Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 33

Latch Setting
In latch setting, it can be set up whether the host number should operate using the GX Works3 parameter or special register.
• In the case of "Do Not Latch", the host number operates using the value set by the parameter setting of GX Works3.
• In the case of "Latch", special relays corresponding to each CH turn on and the host number operates using the value set
by special registers. Value of special registers can be changed by program. The following table shows, special relays and
special registers corresponding for each channel.
CH Special relays
CH1 SM8861
CH2 SM8871
CH3 SM8881
CH4 SM8891
Setting value of special registers or parameter are reflected when the power supply is turned from off to on or
reset.
Precautions
When the SD latch setting valid information is set to off due to memory clear and so on, while special registers are set to
"Latch" by the parameter, the parameter setting becomes valid when the power is turned off to on or reset.
SM/SD for FX3 Series compatible
In the FX5, special relays of the FX3 and special registers of the FX3 can be used in the compatibility area.
Channel numbers may differ between the FX3 and the FX5 depending on the configuration. Select whether to use special
devices for the corresponding channel number (CH1 or CH2) in this setting.
• When this setting is not configured, SM and SD for FX3 series compatibility are not used.
• When this setting is configured, select CH1 or CH2 SM and SD for FX3 series compatibility.
For the device for FX3 series compatible, refer to the following.
Page 35 Related Devices
Special registers
SD8861
SD8871
SD8881
SD8891
6.1 Setup Method for MODBUS Serial Communication
Corresponding parameter
Host station number setting
6 COMMUNICATION SETTING
6
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