61
Technical support / Re:i-7018
« on: May 24, 2011, 12:27:19 PM »
Any idea what may be the problem? Thanks.
Show Posts
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
62
Technical support / Re:i-7018
« on: May 24, 2011, 01:41:18 AM »
Hi. I've tried the null modem and loaded in the I7018 program from the sample folders. Changed all the 3 to 1, since I will be using comm 1 to communicate through RS485. 888 ID is 02. Monitoring 888 through the 485 port using another RS485. Changed the baud rate from original 3 to 6 as I have already changed the I7018 baud from original 9600 to 38600. Confirmed baud rate using ICP software. Changed 0E to 0F as I have changed I7018 to 0F in order to measure K type thermocouple.
---part of i7018 sample program---
SETBAUD 1,6
SETLCD 0,1, CHR$(1)
Z$ = NETCMD$(1,"%01010F0600"+CHR$(13)+"~")
' Note suffix "~" means do not calculate FCS
---end of part of i7018 program---
When Init is pressed, Invalid command is shown on LCD. What could be the problem? Do I have to short pin 7 and pin 8 like what I see on setup paper of the Auto485? Thanks.
---part of i7018 sample program---
SETBAUD 1,6
SETLCD 0,1, CHR$(1)
Z$ = NETCMD$(1,"%01010F0600"+CHR$(13)+"~")
' Note suffix "~" means do not calculate FCS
---end of part of i7018 program---
When Init is pressed, Invalid command is shown on LCD. What could be the problem? Do I have to short pin 7 and pin 8 like what I see on setup paper of the Auto485? Thanks.
63
Technical support / Re:Motor Speed control
« on: May 23, 2011, 01:00:32 PM »
Is there any recommendations on anything that can take in the pulse and tell the PLC the current position if the encoder is 1024 pulse per revolution running at 1500 rpm? Thanks
64
Technical support / Re:i-7018
« on: May 20, 2011, 09:24:12 AM »
Hi. 888 having problem communicating to I7018 through comm 1 using AutoRs 485. Does comm 1 need special 9 pin to communicate with auto rs485 or will a normal cable do? Read from manual that 888 need another type of cable to communicate with modem. Any help? Thanks
65
Technical support / Re:Motor control
« on: May 17, 2011, 10:01:00 AM »
Hi. After playing around with the PLC and motors for a while with no problem, I encountered the same problem when I try to communicate with 4 MD888 using RS485. Trilogi can load using 9 pin to 485 while the motor is off but the same problem came back to haunt me when the motor is on. However, when I try to communicate with individual 888 using 9 pin cable, all works fine. Tried grounding the 9 pin port of the Auto 485 but the same problem still occurs. Any way to solve the problem?
66
Technical support / Re:i-7018
« on: May 04, 2011, 02:30:06 PM »
Hi. If I use a fmd88, can i communicate with 7018 via 232 using auto485, communicate with md888 via 485, and program transfer or excellink connection using lan cable at the same time?
67
Technical support / Re:analogue input control analogue output
« on: May 02, 2011, 11:10:27 AM »
Hi. If I put an interlock for this process, will the response time be better? When this process is run, all other steps are ignored until this process is completed. Thanks.
68
Technical support / analogue input control analogue output
« on: May 02, 2011, 10:45:28 AM »
Hi. If I need to control a motor based on adc(1), how can I get a responsive control? eg, if adc(1) > 15, setdac 1,500. However, when adc(1) < 15, setdac 1,0. It has to do this while looking out for changes from adc(1) until an interupt is activated. Do I use a while loop? thank you.
69
Technical support / Re:modbus or hardwire?
« on: April 18, 2011, 02:35:31 PM »
hi. Thanks for the reply. Can i connect the wire directly from the digital output of plc 1 to digital input of plc 2 if both are sharing the same power supply? Or do i have to use relay instead? Thanks.
70
Technical support / modbus or hardwire?
« on: April 16, 2011, 06:30:11 AM »
hi. If i need a 2 conditions of 888 (1) to be on in order to activate a process controlled by 888(2), before activating 888(3) when few conditions are satisfied. So there will be a total of 3 888 talking to each other. Should I use modbus for them to communicate or should i wire one of the output of 888(1) to input of 888(2) in order to have quick response? Thanks.
71
Technical support / Re:Motor Speed control
« on: April 14, 2011, 01:44:38 PM »
Hi. Am I right to say that the 888 does not support a motor encoder that is travelling at 1500rpm that gives a pulse of 1024 per revolution? Any idea what are the options available to me if i need to get the encoder readings accurately? Thanks.
72
Technical support / Re:Motor Speed control
« on: April 12, 2011, 09:34:33 AM »
sorry. Any idea what's the maximum frequency of 888 or fmd88? Will putting in the negative phase of the encoder from the motor helps? The encoder on the motor is currently 1024 pulse per revolution and top speed of 1500rpm. What can i do to get an accurate reading? Thanks
73
Technical support / Re:Motor Speed control
« on: April 08, 2011, 01:40:00 PM »
Hi. Had tried the method that you mentioned. Looks ok now. However, I have another problem. HSCPV[1] appears the same for both setdac[1],1000 and setdac[1],3500 but the actual distance travelled by the motor is different. The motor is having good repeatability when set at any speed using the method you mentioned but the distance travelled varies even though high speed counter claims that the motor has travelled the same distance. Any idea how to solve it?
Thanks.
Thanks.
74
Technical support / Re:Modbus
« on: February 25, 2011, 09:44:22 AM »
So if slave 1 is getting and writing data from and to slave 2 by RS485, but Master is trying to get and write data to slave 1 by RS485 of Master and RS232 of slave 1, what will happen? Slave 1 will complete the program before giving information to Master?
75
Technical support / Re:Modbus
« on: February 24, 2011, 07:41:40 AM »
Will the ethernet connection be slower than RS485?