ModbusTCP server for Mdunio PLC

#include  <SPI.h>
#include  <Ethernet2.h>
#include  <Mudbus.h>

IPAddress         ip(192, 168, 2, 222);
uint8_t mac[] =   { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

Mudbus            Mb;
uint8_t           sec_cnt;

void setup()
  {
   Ethernet.begin(mac, ip);
   Serial.begin(9600);while(!Serial){delay(10);}
   Serial.println("Serial  : O.K.");
   delay(3000);
   Serial.println("Ethernet: O.K.");
   Serial.print("localIP:  ");Serial.println(Ethernet.localIP());
   sec_cnt=0;
   Mb.R[0] = Mb.R[1] = Mb.R[2] = Mb.R[3] = 0;
   Mb.C[0] = Mb.C[1] = Mb.C[2] = Mb.C[3] = 0;
   Serial.println("");
  }

void loop()
  {uint8_t  count;

   count=0;while(count<200){Mb.Run();delay(5);count++;}

   Mb.R[0]++;Mb.R[0]&=7;
   Mb.R[1] = 1;Mb.R[2] = 2;Mb.R[3] = 3;
   Mb.C[0] ^=1;
   Mb.C[1] = 1;Mb.C[2] = 1;Mb.C[3] = 0;
   Serial.println(sec_cnt++);
  }