10 Application Instructions API 202-313 API 202 Operands: S 1 : Source value S 2 : Slope S 3 : Offset D : Destination device Explanations: 1. Range of S 1 , S 2 , S 3 : -32,768 ~ 32,767 2. Unit of S 2 : 0.001 3. See the specifications of each model for their range of use. 4. Operation equation in the instruction: D = ( S 1 Ч S 2 ) ч 1,000 + S 3. Users have to obtain S 2 and S 3 (decimals are rounded up into 16-bit integers) by using the slope and offset equations below. Slope equation: S 2 = [(max. destination value – min. destination value) ч (max. source value – min. source value)] Ч 1,000 Offset equation: S 3 = min. destination value – min.
source value Ч S 2 ч 1,000 The output curve is shown as the figure: Destination value Source value Max. source value Min. Program Example 1: 1. Assume S 1 = 500, S 2 = 168, S 3 = -4. When X0 = On, SCAL instruction will be executed and obtain the proportional value at D0. 2. Equation: D0 = (500 Ч 168) ч 1,000 + (-4) = 80 DVP-PLC Application Manual 10-1 Mnemonic Operands Function SCAL P Proportional Value Calculation Type OP Bit Devices Word Devices Program Steps X Y M S K H KnX KnY KnM KnS T C D E F SCAL, SCALP:
9 steps S 1 * * * S 2 * * * S 3 * * * D * PULSE 16-bit 32-bit EH3 EH3 EH3 ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV SV2 SV2 SV2 PULSE 16-bit 32-bit EH3 SV2 EH3 ES EX SS SA SX SC EH SV EH3 SV2 ES EX S S SA SX SC EH SV ES EX SS SA SX SC EH SV SV2 D Max. Destin e value S1 Min. destina