Special Relay Details - Mitsubishi Electric FX5 User Manual

Special relay details

Details concerning special relays used for high-speed counters are explained below.
High-speed counter operating
Device for monitoring operation status of each channel of the high-speed counter.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CPU module
CH1 CH2
SM4500 SM4501
High-speed pulse input/output module
First module
CH9 CH10
SM4508 SM4509
■Operation Description
The content of the operation when ON and when OFF is as follows.
Operation when ON
High-speed counter operating
These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
ON
• High-speed counter driven by the HIOEN/DHIOEN instruction
• SPD/DSPD instruction ON execution
• UDCNTF instruction is executed ON (when the FX3 compatible high-speed
counter function is valid)
High-speed counter pulse density/rotational speed being measured
Device for monitoring operation of the high-speed counter when using pulse density/rotational speed measurement mode.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CH1 CH2
SM4516 SM4517
■Operation Description
The content of the operation when ON and when OFF is as follows.
Operation when ON
Pulse density/rotational speed measurement mode operating
Updates measurement results by measuring unit time.
If the FX3 compatible high-speed counter function is valid, these devices operate only when the SPD/DSPD
instruction operates.
CH3 CH4
SM4502 SM4503
Second module
CH11 CH12
SM4510 SM4511
CH3 CH4
SM4518 SM4519
CH5 CH6
SM4504 SM4505
Third module
CH13 CH14
SM4512 SM4513
Operation when OFF
High-speed counter stopped
OFF
• High-speed counter stopped by the HIOEN/DHIOEN instruction
• Power ON, reset, STOP, PAUSE
• UDCNTF instruction is executed OFF (when the FX3 compatible high-
speed counter function is valid)
CH5 CH6
SM4520 SM4521
Operation when OFF
Pulse density/rotational speed measurement mode stopped or not being used
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
24.1 High-speed Counter Function
CH7 CH8
SM4506 SM4507
Fourth module
CH15 CH16
SM4514 SM4515
CH7 CH8
SM4522 SM4523
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