Delays For Accessing Pc Memory - Omron CS1W-ETN11 Operation Manual

Sending Commands From a Host Computer
77 {
78 else{
79 err_exit("send error");
80 }
81
RECEIVE FINS RESPONSE
82 /*
83 addrlen = sizeof(cs_addr);
84 if((recvlen = recvfrom(sockfd,fins_resp,MAX_MSG,0,&cs_addr,&addrlen))
<0){
85 if(errno == EINTR)
86
87 err_exit("receive error");
88 }
89 else{
90 alarm(0); /*
91 printf("recv length %d¥n",recvlen);
92 if(recvlen<14) /*
93
94 if((fins_cmnd[3]!=fins_resp[6])||(fins_cmnd[4]!=fins_resp[7])
95
* DESTINATION ADDRESS CHECK
96
97 }
98 if(fins_cmnd[9]!=fins_resp[9]) /*
99
100 }
101
102
CLOSE SOCKET
103 /*
104 close(sockfd);
105 }
106 /*
ERROR PROCESSING FUNCTIONS
107 *
108 */
109 err_exit(err_msg)
110 char *err_msg;
111 {
112 printf("client: %s %x¥n",err_msg,errno);
113 exit(1);
114 }
115
116 /*
117 * SIGNAL CAPTURE FUNCTIONS
118 */
119 recv_fail()
120 {
121 printf("response timeout error ¥n");
122 }
5-4-4

Delays for Accessing PC Memory

*/
goto CMND_SEND; /*
STOP RESPONSE MONITOR TIMER
ILLEGAL RESPONSE LENGTH CHECK
err_exit("FINS length error");
||(fins_cmnd[5]!=fins_resp[8])){ /
*/
err_exit("illegal source address error");
err_exit("illegal SID error");
*/
The time for the response to be received after a remote node on the Ethernet
network sends a memory area read or write command to a PC can be calcu-
lated using the following formula. This time does not take network transmis-
sion delays into account, so it may be extended under some operating
conditions.
Write command delay time (ms) =
Remote node communications processing time + 4 + (0.011 x number of
words written) + CPU cycle time + CPU data set processing time (Refer to
page 96)
Read command delay time (ms) =
Remote node communications processing time + 8 + (0.011 x number of
RE-SEND FINS COMMAND
*/
SID CHECK
*/
Section 5-4
*/
*/
101