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IP 240 Positioning
To compensate backlash, you can specify that the IP output is to be disabled on a approach to
position only when the direction of travel was positive (ascending actual value). If the position
was approached in a negative direction, the IP output remains set and the position is ”overrun”.
When the BEE2 range is exited, the output must be reset over the S5 CPU (via embedded
commands to the IP 240). The position must then be reselected.
With the same logic, synchronization is attained following an approach to reference point only
when the reference point was reached from a positive direction.
Actual value-dependent interrupt generation
During configuring, you specify at which points on an approach to position the IP 250 is to
generate interrupts. By reading the interrupt request bytes from the IP 240, you can react
appropriately to the cause of the interrupt.
Interrupts can be generated at the following points:
• On entry into ranges BEE1, BEE2 and BEE3.
• Upon unintentional exiting of range BEE3 (target range exited).
• On exiting range BEE2 (reversal of direction to compensate for backlash possible).
Fig. 10-9. Actual Value-Dependent Interrupt Generation
BEE1
Target
position
BEE3BEE3
Exiting of
target range
(range BEE3)
BEE1BEE2BEE2
Actual value
Entry into
range BEE1
Entry into
range BEE3
Exiting of
target range
BEE2
Entry into
range BEE2
Direction of travel Direction of travel
All interrupts are generated only once per selected position.
Methods of synchronization
Positioning with the IP 240 is possible only following synchronization of the actual value. Three
methods of synchronization are available for this purpose.
a) Reference point approach
For reference point approach, you can calibrate the actual value to a fixed reference point in
the traverse range with the aid of the incremental encoder's zero mark signal.
To make reference point approach possible, you must connect a preliminary contact switch to
the IP 240's IN input.
b) Synchronization with an internal control bit
This method of synchronization is referred to in the following as software-controlled synchro-
nization.
Each time a set control bit is transferred, you can reset the actual value and reactivate the po-
sition last selected. Positioning then begins immediately.
EWA 4NEB 811 6120-02a
10-9
- SIMATIC S5 1
- Counter/Positioning/ 1
- Position Decoder Module 1
- Copyright © Siemens AG 1990 2
- First Printing, March 1991 2
- EWA 4NEB 811 6120-02c 3
- IP 240 Preface 5
- Introduction 6
- Introduction IP 240 7
- Conventions 10
- EWA 4NEB 811 6120-02a 11
- 1 System Overview 13
- System Overview 14
- 2.2 Technical Specifications 18
- 2.2.2 Counting 19
- 2.2.3 Inputs/Outputs 20
- 2.3 LEDs 23
- 2.4 Order Numbers 24
- 3 Addressing 27
- Addressing IP 240 28
- IP 240 Addressing 29
- 4 Hardware Installation 32
- 4.2 Wiring 35
- 4.2.1 Wiring Method 35
- 4.3 Installation Examples 38
- 4.3.1 Inputs 38
- 4.3.2 Outputs 43
- ((1887/3)) 43
- 6.1.2 Digital Outputs 56
- 6.1.3 Interrupt generation 56
- 6.1.4 LEDs 56
- 6.2 Programming 57
- 6.2.2 Control Function Blocks 58
- 6.2.3 Data Blocks 58
- 6.3 Restart Characteristics 59
- 6.3.1 Power On 59
- 6.3.2 CPU STOP 59
- 6.4 Fault and Error Flagging 59
- 6.5 Multiprocessor Operation 62
- 7 Position Decoding 65
- 7.2.2 Resolution 67
- 7.2.3 Reference Tracks 68
- 7.2.4 Hysteresis 73
- 7.2.5 Forcing the IP Outputs 77
- 7.3.2 Control Function Block 87
- 67: KH = 7450; 99
- Position Decoding IP 240 100
- IP 240 Position Decoding 101
- 8 Counting 126
- Counting IP 240 127
- 8.2.2 Final Value 128
- 8.2.3 Forcing the IP Output 128
- IP 240 Counting 130
- 8.3.2 Control Function Block 136
- 9 IP 252 Expansion 156
- IP 252 Expansion IP 240 157
- IP 240 IP 252 Expansion 158
- YOU must 159
- 9.4.2 Data Block Contents 162
- 10 Positioning 167
- 10.1.2 Functional Description 168
- IP 240 Positioning 169
- Positioning IP 240 170
- Switching the IP outputs 173
- 10.3 Numerical Representation 176
- - Actual value 178
- 10.4 Axis Types 180
- 10.4.1 Linear Axis 180
- 10.4.2 Rotary Axis 181
- 10.5 Switching the IP Outputs 183
- 10.7 Actual Value Generation 189
- 10.7.1 Resolution (AFL) 190
- · Specified resolution 191
- 10.7.2 Zero Offset 192
- A negative value must be spe 194
- = - 2,000 194
- a 214
- 10.14 Selecting a Position 216
- 10.14.2 Selecting Position 0 218
- DR n+3 231
- : JU FB 168 232
- 10.23.1 The Data Block 241
- DW 32 to 242
- = 0 Relative zero offset 248
- • Actual value 253
- Format Description 258
- Exceeding 255 260
- With offset 15 you address: 297
- 11.1.1 Status Register 298
- Read error codes 300
- IDLE=1? 301
- 11.4.1 Position Decoding Mode 306
- 11.4.2 Counting Mode 310
- 11.4.3 Reading Error Messages 313
- 11.5 Sample Programs 314
- 12 Response Times 321
- Response Times IP 240 322
- IP 240 Response Times 323
- 12.3 Firmware Execution Times 324
- 13 Encoder Signals 329
- 13.1.2 Timing Requirements 330
- IP 240 Encoder Signals 331
- Encoder Signals IP 240 332
- EWA 4NEB 811 6120-02 a 335
- 14 Error Messages 337
- Invalid hysteresis 338
- 14.2.2 Communications Errors 339
- 14.4.1 Parameter Errors 339
- 14.4.2 Data Errors 340
- =02 Error on selecting HASY 341
- 14.4.3 Communications Errors 342
- Adapter Casing (S5 Adapter) 343
- A.1 Prerequisites 344
- A.4 Interrupt Processing 347
- A.5 Technical Specifications 348
- Addressing S5 Modules 349
- (Adapter Casing and IM 463-2) 349
- B.1 Addressing S5 Modules 350
- I/O area (P area) 351
- Page area 351
- Positioning Module 353
- C.1 Overview 354
- Example: 355
- Standard functions: 355
- Examples: 355
- C.2 Counting Functions 356
- Function FC 171 (STRU_DOS) 356
- Function FC 172 (STEU_DOS) 357
- EWA 4NEB 811 6120-02b 358
- Function FC 164 (STRU_WEG) 359
- Function FC 170 (STEU_WEG) 360
- C.4 Positioning Functions 362
- Function FC 167 (STRU_POS) 362
- Function FC 168 (STEU_POS) 363
- Addresses 368
- Cyclic Program 370
- Interrupt Program 371
- DB 170.DBB 45 Hysteresis 377
- IP 240 Index 388
- Index IP 240 389
- 6-1, 10-12, 10-13 393
- 6-1, 7-1 ... 7-3, 7-5 397
- EWA 4NEB 811 6120-02 398
- 5 Operation 409
- 5.1.1 IRx Interrupt Circuits 410
- 5.1.2 I/O Byte 0 (PY) 411
- Master or Slave 412
- Enable for I/O byte 0 412
- IP 240 Operation 413
- 5.2 Output Inhibit (BASP) 414
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