PLC Link6-126.4 PLC Link Response Time6.4.1 Response Time of 1 Transmission CycleThe maximum value for the transmission time (T) of one cycle can be calculated using thefollowing formula. Calculation formula(1) Ts (transmission time per station)Calculationformula Ts = Scan time + Tpc (PLC link sending time)Tpc = Ttx (sending time per byte) x Pcm (PLC link sending byte size)Ttx = 1 / (transmission speed kbps × 1000) × 11ms … Approx. 0.096 ms at 115.2 kbpsPcm = 23 + (number of relay words + number of register words) x 4 (4 times based on ASCIIcode)(2) Tlt (link table sending time)Calculationformula Tlt = Ttx (sending time per byte) x Ltm (link table sending size)Ttx = 1 / (transmission speed kbps × 1000) × 11 ms … Approx. 0.096 ms at 115.2 kbpsLtm = 13 + 2 × n (n = No. of added stations)(3) Tso (Master station scan time)This should be confirmed using the programming tool.(4) Tlk (link addition processing time)CalculationformulaWhen there is no station that is yet to be added to the link, Tlk = 0Tlk = Tlc (link addition command sending time) + Twt (addition waiting time)+ Tls (sending time for command to stop transmission if link error occurs) + Tso (master stationscan time)Tlc = 10 x Ttx (sending time per byte)Ttx = 1 / (transmission speed kbps × 1000) × 11ms … Approx. 0.096 ms at 115.2 kbpsTwt = Default value: 400 msTls = 7 x Ttx (sending time per byte)Ttx = 1 / (transmission speed kbps × 1000) × 11ms … Approx. 0.096 ms at 115.2 kbpsTso = Master station scan timePhone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
