FP
Σ
User's Manual
8.7 PLC Link
241
Calculation example 4
Conditions: All stations have been added to an 8-unit link. Highest station number = 8. Relays
and registers have been evenly allocated. Scan time for each PLC: 5ms.
Ttx = 0.096
Pcm (per station) = 23 + (8 + 16)
×
4 = 119
Tpc = Ttx
×
Pcm = 0.096
×
119
≈
11.43ms
Ts (per station) = 5 + 11.43ms = 16.43ms
Tlt = 0.096
×
(13 + 2
×
8) = 2.79ms
Given the above conditions, the maximum value for the transmission time (T) of one cycle will be:
T max. = 16.43
×
8 + 2.79 + 5 = 139.23ms
Calculation example 5
Conditions: All stations have been added to a 2-unit link. Highest station number = 2. Relays
and registers have been evenly allocated. Scan time for each PLC: 5ms.
Ttx = 0.096
Pcm (per station) = 23 + (32 + 64)
×
4 = 407
Tpc = Ttx
×
Pcm = 0.096
×
407
≈
39.072ms
Ts (per station) = 5 + 39.072 = 44.072ms
Tlt = 0.096
×
(13 + 2
×
2)
≈
1.632ms
Given the above conditions, the maximum value for the transmission time (T) of one cycle will be:
T max. = 44.072
×
2 + 1.632 + 5 = 94.776ms
Calculation example 6
Conditions: All stations have been added to a 2-unit link. Highest station number = 2. 32
relays and 2 register words have been evenly allocated. Scan time for each PLC: 1ms.
Ttx = 0.096
Pcm (per station) = 23 + (1 + 1)
×
4 = 31
Tpc = Ttx
×
Pcm = 0.096
×
31
≈
2.976ms
Ts (per station) = 1 + 2.976 = 3.976ms
Tlt = 0.096
×
(13 + 2
×
2)
≈
1.632ms
Given the above conditions, the maximum value for the transmission time (T) of one cycle will be:
T max. = 3.976
×
2 + 1.632 + 1 = 10.584ms
NOTE
•
In the description, "stations that have been added" refers to stations which
are connected between station no. 1 and the highest station number and for
which the power supply has been turned on.
•
Comparing examples 2 and 3, the transmission cycle time is longer if there
is one station that has not been added to the link. As a result the PLC link
response time is longer.
•
The SYS1 instruction can be used to minimize the transmission cycle time
even if there are one or more stations that have not been added to the link.
Summary of Contents for AFPG951T34
Page 7: ......
Page 17: ......
Page 18: ...Chapter 1 Safety Measures ...
Page 21: ......
Page 22: ...Chapter 2 Overview ...
Page 32: ...Chapter 3 CPU Types ...
Page 47: ...CPU Types FPΣ User s Manual 30 LD Body ...
Page 51: ...CPU Types FPΣ User s Manual 34 POU Header and LD Body ...
Page 55: ...CPU Types FPΣ User s Manual 38 LD Body ...
Page 57: ......
Page 58: ...Chapter 4 Expansion ...
Page 73: ......
Page 74: ...Chapter 5 I O Allocation ...
Page 81: ......
Page 82: ...Chapter 6 Installation and Wiring ...
Page 115: ......
Page 116: ...Chapter 7 High Speed Counter and Pulse Output ...
Page 169: ......
Page 170: ...Chapter 8 Communication ...
Page 227: ...Communication FPΣ User s Manual 210 LD Body ST Body ...
Page 233: ...Communication FPΣ User s Manual 216 POU Header LD Body ...
Page 236: ...FPΣ User s Manual 8 6 Program Controlled Communication 219 POU Header LD Body 1 2 ...
Page 237: ...Communication FPΣ User s Manual 220 2 2 ST Body ...
Page 266: ...Chapter 9 Security Functions ...
Page 273: ......
Page 274: ...Chapter 10 Other Functions ...
Page 277: ......
Page 278: ...Chapter 11 Troubleshooting ...
Page 289: ......
Page 290: ...Chapter 12 Appendix ...