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7-11
7.4 Remote I/O Update Timing Method
if the normal I/O update (refresh) and remote I/O update (refresh) are performed after completing the
scan of normal I/Os (on the master station) and remote I/Os, it will take a considerable amount of scan
time for processing remote I/O as a large number of slave stations or I/O points are controlled.
Accordingly, a "Wait time" will be created on the I/O scan time.
In this case, when you select "Scan time asynchronous mode", the I/O will be updated (refreshed)
without waiting for the completion of the scan for remote I/Os. Thus the wait time will be eliminated and
the normal I/O scan time can be shorter.
- The factory default setting is set to "Scan time synchronous mode".
- It is set with the system register No. 36.
- "Scan time asynchronous mode" is effective when the normal I/O processing tiem (scan time) is shorter
than the remote I/O processing time (scan time).When the remote I/O processing time is shorter than the
normal I/O processing time, the I/O update (refresh) is synchronized with the normal I/O processing. So,
even if the "Scan time asynchronous mode" is set, the timing is the same as the scan time synchronous
mode.
7.4.1 Scan Asynchronous Mode
Setting
- System register No. 36: 1
[Operation]
- The normal I/O update (refresh) is performed after completing the processing of normal I/Os even if
remote I/O processing has not been completed yet.
- The remote I/O update (refresh) is performed after completing the processing of remote I/Os.
Summary of Contents for MEWNET-F
Page 9: ...Chapter 1 Functions and Restrictions of the Unit ...
Page 19: ...Chapter 2 Part Names and Functions ...
Page 40: ...2 22 ...
Page 41: ...Chapter 3 Unit Specifications ...
Page 52: ...3 12 ...
Page 53: ...Chapter 4 Installation and Wiring ...
Page 62: ...4 10 ...
Page 63: ...Chapter 5 Connection for the Remote I O System ...
Page 75: ...Chapter 6 Remote I O Map ...
Page 84: ...6 10 ...
Page 85: ...Chapter 7 Operation Modes for Controlling MEWNET F ...
Page 97: ...Chapter 8 Control by MEWNET F ...
Page 108: ...8 12 Flowchart ...
Page 110: ...8 14 ...
Page 111: ...Chapter 9 Troubleshooting ...
Page 120: ...9 10 ...
Page 121: ...9 11 9 5 2 When the ALARM LED is ON ...
Page 122: ...9 12 9 5 3 When the Communication LED on the Master Unit does Not Flash Normally ...
Page 123: ...9 13 When the COMM LED is OFF ...
Page 124: ...9 14 When the COMM LED is ON ...
Page 125: ...9 15 9 5 4 When the Communication LED on a Slave Station does Not Flash Normally ...
Page 126: ...9 16 When the COMM LED is OFF ...
Page 127: ...9 17 When the COMM LED is ON ...
Page 128: ...9 18 9 5 5 When the CPU does Not Operate ...
Page 129: ...9 19 9 5 6 When the Input Output Function of a Slave Station does Not Work ...
Page 130: ...9 20 9 5 7 When the Memory Access Function for the Advanced Unit s Memory does Not Work ...
Page 134: ...9 24 ...
Page 135: ...Chapter 10 Dimensions ...
Page 136: ...10 2 10 1 FP2 Multi wire Link Unit AFP2720 10 2 FP3 Remote I O Master Unit AFP3742 ...
Page 137: ...10 3 10 3 FP2 Remote I OSlave Unit AFP2745 10 4 FP3 Remote I OSlave Unit AFP3745 ...
Page 141: ...10 7 10 8 FP0 I O Link Unit AFP0732 ...
Page 142: ...10 8 ...
Page 143: ...Chapter 11 Appendix 1 I O Link With FP1 ...
Page 147: ...11 5 11 3 Part Names and Functions ...
Page 159: ...Chapter 12 Appendix 2 I O Link With FP0 ...
Page 164: ...12 6 ...
Page 166: ......
Page 167: ......
Page 168: ...FAF 35E 1 200803 http www mew co jp ac e fasys 2008 ...