2 Functions of Devices in DVP-PLC EH2/SV series MPU supports high speed counters. C235 ~ C240 are program-interruption 1-phase high speed counter with a total bandwidth of 20kHz, can be used alone with a counting frequency of up to 10kHz. EH3/SV2 series MPU supports high speed counters. C235~C240 are program-interruption 1-phase high speed counter, and can be used with a counting frequency of up to 10kHz. C241 ~ C254 are hardware high speed counter (HHSC). There are four HHSC in EH2/SV/EH3/SV2 series MPU, HHSC0 ~ 3.
The pulse input frequency of HHSC0 and HHSC1 can reach 200kHz, and that of HHSC2 and HHSC3 can reach 20kHz (1 phase or A-B phase).The pulse input frequency of HHSC0 ~ 3 of 40EH2/40EH3 series MPU can reach 200kHz, among which: C241, C246 and C251 share HHSC0 C242, C247 and C252 share HHSC1 C243, C248 and C253 share HHSC2 C244, C249 and C254 share HHSC3 1. Every HHSC can only be designated to one counter by DCNT instruction. 2. There are three counting modes in every HHSC (see the table below): a) 1-phase 1 input refers to “pulse/direction” mode. b) 1-phase 2 inputs refers to “clockwise/counterclockwise (CW/CCW)” mode. c) 2-phase 2 inputs refers to “A-B phase” mode. U:
Progressively increasing input A: A phase input S: Input started B: Progressively decreasing input B: B phase input R: Input cleared 3. System structure of the hardware high speed counters: a) HHSC0 ~ 3 have reset signals and start signals from external inputs. Settings in M1272, M1274, M1276 and M1278 are reset signals of HHSC0, HHSC1, HHSC2 and HHSC3.
Settings in M1273, M1275, M1277 and DVP-PLC Application Manual 2-24 Program-interruption Hardware high speed counter Counter type high speed counter 1-phase 1 input 1-phase 1 input 1-phase 2 inputs 2-phase 2 inputs Type Input C235 C236 C237 C238 C239 C240 C241 C242 C243 C244 C246 C247 C248 C249 C251 C252 C253 C254 X0 U/D U/D U A X1 U/D D B X2 U/D R R R X3 U/D S S S X4 U/D U/D U A X5 U/D D B X6 R R R X7 S S S X10 U/D U A X11 D B X12 R R R X13 S S S X14 U/D U A X15 D B X16 R R R X17 S S S