Rockwell Automation 1747-ASB Remote I/O Adapter - Manual (Page 82)

Publication 1747-UM006B-EN-P - June 2003
5-4 Installation and Wiring
Link Termination
A 6-pin keyed connector provides a quick connection to the RIO link
and processor restart lockout switch. A user-supplied terminating
resistor must be attached across line one and two of the connector at
each end of the RIO link. The
Ω
size of the resistor depends on the
baud rate and whether the scanner and all adapters have extended
node capability, as shown in the table below. The cable shield must
be connected to chassis ground only at one end of the RIO link.
Baud Rate Terminating Resistor Size
Using Extended Node Capability All Baud Rates 82
Ω
1/2 Watt
Not Using Extended Node Capability
57.6K baud 150
Ω
1/2 Watt
115.2K baud 150
Ω
1/2 Watt
230.4K baud 82
Ω
1/2 Watt
IMPORTANT
If the signal integrity on the RIO link is compromised
by environmental noise, improper termination,
and/or improper cable installation, the 1747-ASB
module scan rate drops. This is indicated by a
pronounced flickering of the status display.
ADAPTER
Blue
Clear
Shield
1
23
45
6
7
8
SW1
1 2
3
45
67
8
SW2
1 2
3
4
5
67
8
SW3
O N
O N
LINE 1
SHLD
LINE 2
NC
IN
RET
(MSB)
LOGICAL
RACK
(LSB)
LOGICAL
GROUP
BAUD
RATE
PRI/COMP
RSV
(MSB)
(LSB)
IMAGE
SIZE
HLS
PRL
RESP
LAST CHA
ADDR
MODE
SP MODE
KEY
1747–ASB
ST ATUS
COMM F AUL T
LINE 1 (Blue wire)
SHLD (Shield wire)
LINE 2 (Clear wire)
NC (No Connect)
IN
RET
To Scanner’s
Connector
Chassis Ground
Terminating Resistor
Terminating Resistor
Status Display