ISPSoft User Manual

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Chapter 6 Symbols Application Example AH500 DVP Depending on the MOV 100 VWD@E0 rules of the instructions Modifying an operand in an instruction Modifying a contact or coil Modifying a symbol whose data type is ARRAY LD VBL_0@E0 OUT VBL_1@E1 ARY[0]@E0 Supporting the modification Supporting the modification Depending on the rules of the instructions Depending on the models Supporting the modification *1. In an AH500 series CPU module, only the E devices are index registers. In a DVP series PLC, the E devices and the F devices are index registers. Please refer to the operation manual for a model for more information. *2. An index register can not be modified by another index register. For example, E0@E1 is not allowed. As a result, before a symbol is modified by an index register, users have to make sure that the device assigned to the symbol is not an E device or an F device. Additional remark (a) The data stored in an index register indicates the offset for a device modified. If the system automatically assigns a device to a symbol modified, the use of an index register will cause the program to be executed incorrectly because users do not know which device is assigned to the symbol. (b) If the addition of the value in an index register to a device address produces a device address which is not within the range, the PLC will operate incorrectly. As a result, users have to be more careful when they modify a symbol with an index register. Take AHCPU530-EN for example. If the value in E0 is larger than 35, the operand D65500@E0 represents a device which is not within the range of data registers, and an error occurs in the CPU module. (c) If the value in an index register is changed, the device which actually operates differs from the original device. As a result, if the original device is not used in the program, the final value in the original device is retained. Take AHCPU530-EN for example. In the figure below, if the value in E0 is 2. M102 is ON when M0 is ON. If the value in E0 is changed from 2 to 3, the device which actually operates becomes M103. M103 is ON when M0 is ON. Owing to the fact that M102 is not used in the program, M102 remains ON. 6.1.6 Bit in a Device Represented by a Symbol (Only for AH500 Series CPU Modules) An AH500 series CPU module supports the manipulation of the bits in a word device. The format is Word device.Bit number. For example, D0.2 indicates that bit 2 in D0 is manipulated. The same rule applies to the symbols. The format is Identifier.Bit number, e.g. VB.2. The rule also applies to the symbols whose data type is ARRAY. The format is Identifier[Index].Bit number, e.g. Ary[0].1. The bit number must be a decimal constant. No matter what the data type of a symbol modified is, 6-7
ISPSoft User Manual the bit number must be within the range between 0 and 15. Besides, the bits in a device represented by a symbol whose data type is BOOL, STEP, COUNTER, TIMER, a function block, HC_POINTER, C_POINTER, or T_POINTER can not be manipulated. In the figure below, the data type of VB is WORD. Suppose the present value of VB is 0. When M0 is ON, the value of bit 2 in the device represented by VB is 1, that is, the value of VB is 4. In an AH500 series CPU module, an index register can be used with the manipulation of the bits in a device. If an index register is used with the manipulation of the bits in a device, the mark @ has high priority. Please refer to the following example. The data type of VB is WORD. Example 1: VB.1@E0 (VB represents D100. The value in E0 is 3.) 1@E0 is interpreted first. As a result, VB.1@E0 is equivalent to VB.4. The bit which is actually manipulated is bit 4 in D100. Example 2: VB@E0.1 (VB represents D100. The value in E0 is 3.) VB@E0 is interpreted first. As a result, VB@E0.1 represents D103.1. The bit which is actually manipulated is bit 1 in D103. Example 3: VB@E0.1@E1 (VB represents D100. The value in E0 is 3, and the value in E1 is 2.) VB@E0 and 1@E1 are interpreted separately. As a result, VB@E0 represents D103, and 1@E1 represents 3. VB@E0.1@E1 represents D103.3. The bit which is actually manipulated is bit 3 in D103. *1. If a bit in a device is manipulated, the system will faithfully get the state of the bit. Users have to judge whether the state of the bit is significant by themselves. *2. In the present version of ISPSoft, a bit number must be within the range between 0 and 15. However, in the future version of ISPSoft, the data length of a symbol will allow the bit number to be within the range between 0 and 31, or between 0 and 63, and a symbol will represent a bit, e.g. VB.VC. 6.2 Managing the Symbols in ISPSoft 6.2.1 Symbol Tables • Global symbol table Double-click Global Symbols in the project management area to open the Global Symbols window. 6-8
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ISPSoft User Manual Preface ISPSoft
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Chapter 1 Introduction of the Softw
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Chapter 3 Configuring and Setting a
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Chapter 8 Ladder Diagram Table of C
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Chapter 16 Network Configuration an
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Appendix C Print Management Tool Ta
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Appendix C Print Management Tool C.
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