7 Application Instructions API 50-99 Operands: D : Destination device Explanations: 1. See the specifications of each model for their range of use. 2. When ALT instruction is executed, “On” and “Off” of D will switch. 3. This instruction adopts pulse execution instructions (ATLP). Program Example 1: When X0 goes from Off to On, Y0 will be On. When X0 goes from Off to On for the second time, Y0 will be Off. X0 ALTP Y0 X0 Y0 Program Example 2: Using a single switch to enable and disable control. At the beginning, M0 = Off, so Y0 = On and Y1 = Off. When X10 switches between On/Off for the first time, M0 will be On, so Y1 = On and Y0 = Off.
For the second time of On/Off switching, M0 will be Off, so Y0 = On and Y1 = Off. X10 M0 Y0 M0 Y1 Program Example 3: Generate flashing. When X10 = On, T0 will generate a pulse every 2 seconds and Y0 output will switch between On and Off following the T0 pulses. DVP-PLC APPLICATION MANUAL 7-59 API Mnemonic Operands Function 66 ALT P Alternate State Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F ALT, ALTP: 3 steps D * * * PULSE 16-bit 32-bit EH3 EH3 ES EX SS SA SX SC EH SV EH3 SV2 ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV SV2 SV2 ALT M0 X1 TMR T0 K20 T0 ALTP Y0 T0 K20