Ron, first of all thank you for your answer and help!
Yes, you are right, I am using a 1771-ASB Series E. The whole topology is one 1756-A7 chassis (7 slots), where I have a 1756-L63 processor, next a 1756IB16 module (not used in these tests, it can be removed if needed) and a 1756DHRIO E. On the other hand I have the remote I/O 12 slots rack. I have everything on a local laboratory in my office.
Remote I/O Chassis data:
The chassis has 12 slots (i.e. in the first slot you insert the 1771-ASB, then there are other 12 slots left).
Next I list the slots of the chassis:
Slot A = 1771-ASB
Slot B = 1771-OW16 B
Slot C = Empty
Slot D = Empty
Slot E = Empty
Slot F = Empty
Slot G = Empty
Slot H = Empty
Slot I = Empty
Slot J = Empty
Slot K = Empty
Slot L = Empty
Slot M = Empty
Switchs set using User Manual Cat. No. 1771-ASB Series E
DIP Switchs on the ASB module:
Figure 2.7 - Module Switch Assembly Settings for PLC-5 Family, SLC and ControlLogix Processors With Complementary I/O
S1 switchs:
switch 1 ON --- must be always ON
switch 2 ON --- must be always ON
switch 3 ON --- Primary chassis
switch 4 ON \
Switch 5 ON |- I/O Rack # 1
Switch 6 OFF /
switch 7 ON \
|- First I/O Group Number 0
Switch 8 ON /
S2 Switchs:
Switch 1 OFF \
|- 230.4 K Baud
Switch 2 ON /
Switch 3 ON --- Primary chassis
Switch 4 OFF --- all slots
Switch 5 OFF --- unrestricted
Switch 6 OFF --- must be always OFF
DIP Switch on the chassis backplane (located BEHIND - but NOT on - the ASB module):
Figure 2.11 - I/O Chassis Backplane Switch Assembly Settings for Remote Adapter Module in PLC-5 Family, SLC and ControlLogix Processor Systems in Remote Configuration
Switch 1 OFF --- outputs of this I/O chassis are deenergized when a fault is detected
Switch 2 ON --- processor can restart I/O chassis
Switch 3 OFF --- must be always OFF
Switch 4 OFF --- must be always OFF
Switch 5 OFF \
|- 1/2-slot addressing
Switch 6 ON /
Switch 7 OFF --- must be always OFF
Switch 8 OFF --- must be always OFF
ControlLogix 1756-L63 Data:
1756DHRIO Settings:
Switch 1: 1 --- (channel A as RIO Scanner)
Switch 2: 0 \
|- Channel A address 6
Switch 3: 6 /
Switch 4: 0 \
|- Channel B address 2
Switch 5: 2 /
Switch 6: 1 --- (channel B as RIO Scanner - not used)
ControlLogix Configuration:
On my I/O Configuration I have, first of all (slot 0) the 1756-L63 processor, next (slot 1) the 1756-IB16 module and finally (slot 2) I have the 1756-DHRIO/D RIO module.
1756-DHRIO/D RIO properties:
Tab General:
Slot: 2
Channel A: Type RIO, Baud Rate 230.4K
Channel B: Type RIO, Baud Rate 57.6K (Not used)
Revision: 6 1 Electronic Keying: Compatible Keying
Tab Connection:
RPI: 25.0
Under 1756-DHRIO Module I have CHA, Remote I/O and CHB, Remote I/O.
Under CHA I added a module: A <001 0 1>1771-ASB
A <001 0 1>1771-ASB properties:
Tab General:
Rack # (octal): 1
Starting Group: 0
Size: Full Rack (8 I/O Groups)
Tab Connection:
RPI: 48.0
With this system, I go online on RSLogix 5000 and I see the ASB module running with no errors, with leds on DHRIO module as next described:
CH A ON Green
CH B OFF
OK ON Green
The three leds on 1771-ASB module are off.
I have connected the 82 ohms resistors on both sides of the wiring, the wiring is ok.
Note: If I add a digital input module (1771-IBD B), I can see succesfully monitoring the Controller Tags, but nevertheles the ASB active led is never ON.
If you need any other thing, don't hesitate
Thank you very much!
Greetings
Fernando