adccommunitymod (AutomationDirect) asked a question.
Created Date: June 04,2006
Created By: erict3
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I am doing an experiment with collecting info on a piece of existing equipment. I have a composite cable that has a few spare twisted shielded pairs and would like to use the bottom port of a DL250-1 cpu and one slave using a D2-RSSS. I will not be able to get access to the equipment for some time and would like to set up my monitoring equipment on my test bench for testing. I have not used the RSSS modules before and have a few questions. Is the RSSS Link light “on� just when there is a baud, cable or termination resistor problem? I would like to use a couple of feet of wire in order hook it up on my bench. The resistance of the wire is very low. Will this mean that I will have to add resistors in order to reach the 100-500 ohm range?
Created Date: June 04,2006
Created by: bcarlton
I'll only address your understanding of the termination resistance. This isn't the resistance of the wire from end to end as seen with an ohmmeter. Check out this site
For best transmission look up the 'characteristic impedence ' of the wire you are using and place that resistance ACROSS the wires at the physical end points. This helps avoid the reflections caused by a mismatch.
Created Date: June 04,2006
Created by: erict3
Thanks for the reply. That makes a bit more sense.
As to the link fault light on the D2-RSSS, will it go out when when the cabling is correct or will the programming also affect it.
Created Date: June 04,2006
Created by: bcarlton
Our applications using the system have used the RMSM as a master. The wiring is fairly simple then. Though the manual shows very explicitly the wiring to a 250. Setting up baud rates is just matching DIP switch settings between the RMSM and RSSS. The manual does seem to say that the Link light only comes on for wiring problems or communication rate mismatches. I would say that it would go away when corrected and power cycled.
Created Date: June 06,2006
Created by: erict3
Thanks for the help. It turned out that the link light would not go out until the setup program was complete and the program had been restarted. No resistors were required for the 2 ' of cat5 cable that I was using.
I had gotten spoiled by the pointer method of dealing with analog cards. I was stumped until realizing that that flashing number in my data view was the info from all 48 of the channels being scanned into one location. I haven't been able to find any info on using the muliplex method with an RSSS module other than the statement that I must.
Any info on calculating the active channel input addresses would be welcome.
Created Date: June 07,2006
Created by: Tech Guy
Using the multiplexing method is described in the Analog Manual. It works the same way as it does when the analog module is in the main rack, just change the addressing accordingly.
Created Date: June 07,2006
Created by: erict3
I have worked out the active channel indicators for the 8 point analog input mod that is in the slot next to the RSSS but am somewhat at a loss for my next step in addressing the next 2 modules.
When setting up the slave I gave it a starting address of O40410 with 48 as the number inputs. My active channel indicators for the first slot are x214, x215 and x216.
I am able to read the first 8 AI module in the slave but am having trouble with how to address the next AI and DI.
Created Date: June 07,2006
Created by: FACTSTech
With V40410 as your starting address the first 8AI module (I'm assuming F2-08AD-1 or 2) occupies X200-X217. The next AI module will occupy X220-X237 and the DI module (assuming it is a 16DI) will occupy X240-X257.
Created Date: June 07,2006
Created by: erict3
I would have thought that too, but I have no active channel indicators with the exception of those that I referred to on the slave.
Created Date: June 07,2006
Created by: FACTSTech
What are the part numbers of the I/O modules in the D2-RSSS base?
Created Date: June 07,2006
Created by: erict3
I have a D2-04BDC1-1 with a D2-RSSS, F2-08AD-1, F2-04RTD and a D2-16ND3-2.
V2000-V2007 display fine.
Here is a copy of the program as it stands now.
PLC 250(-1)
// Rung 1
// Address 0
STR SP0
GTS K1
// Rung 2
// Address 3
STRN X216
LD VX200
ANDD Kfff
BCD
// Rung 3
// Address 8
#BEGIN COMMENT
"Remote Slave "
" "
"Slot 1 "
" "
"Load Channel 1 "
#END
STRN X214
ANDN X215
ANDN X216
OUT V2000
// Rung 4
// Address 12
#BEGIN COMMENT
"Load Channel 2 "
#END
STR X214
ANDN X215
ANDN X216
OUT V2001
// Rung 5
// Address 16
#BEGIN COMMENT
"Load Channel 3 "
#END
STRN X214
AND X215
ANDN X216
OUT V2002
// Rung 6
// Address 20
#BEGIN COMMENT
"Load Channel 4 "
#END
STR X214
AND X215
ANDN X216
OUT V2003
// Rung 7
// Address 24
#BEGIN COMMENT
"Load Channel 5 "
#END
STRN X214
ANDN X215
AND X216
OUT V2004
// Rung 8
// Address 28
#BEGIN COMMENT
"Load Channel 6 "
#END
STR X214
ANDN X215
AND X216
OUT V2005
// Rung 9
// Address 32
#BEGIN COMMENT
"Load Channel 7 "
#END
STRN X214
AND X215
AND X216
OUT V2006
// Rung 10
// Address 36
#BEGIN COMMENT
"Load Channel 8 "
#END
STR X214
AND X215
AND X216
OUT V2007
// Rung 11
// Address 40
END
// Rung 12
// Address 41
SBR K1
// Rung 13
// Address 43
#BEGIN COMMENT
"Port Setup Data "
" "
#END
STR SP0
LD Kbfc0
OUT V7656
LD K8
OUT V7655
LD K500
OUT V7657
// Rung 14
// Address 50
#BEGIN COMMENT
"Slave Setup Data "
#END
STR SP0
LDA O40410
OUT V37704
LD K48
OUT V37705
LDA O40420
OUT V37706
LD K0
OUT V37707
// Rung 15
// Address 59
STR SP0
SET C740
// Rung 16
// Address 61
RT