Archives

Configuration Parameters

The DIP switches allow you to configure the following items:

• Starting Logical Rack Number (Logical Rack) – is the 1747-ASB module’s

starting logical rack number in the scanner’s image.

• Starting Logical Group Number (Logical Group) – is the 1747-ASB

module’s starting logical group number within the scanner’s image.

• Baud Rate (Baud Rate) – is the 1747-ASB module’s RIO link communication

rate. The baud rate must be the same for all adapters on the RIO link.

• Primary/Complementary SLC Chassis (PRI/COMP) – determines

whether the 1747-ASB module appears to the scanner as a primary or

complementary chassis.

• Adapter Image Size (IMAGE SIZE) – indicates the I/O image size to be

reserved for the adapter. It can be any size between 2 and 32 groups in

2 logical group increments.

• Hold Last State (HLS) – determines whether the discrete output modules

are held in their last state when:

– RIO link communication with the 1747-ASB module is lost.

– The scanner inhibits the 1747-ASB module.

– The scanner sends Reset, Adapter Decide commands to the 1747-ASB module.

• Processor Restart Lockout (PRL) – determines whether the 1747-ASB

module automatically resumes RIO link communications if communication is

lost and then restored.

• Link Response Time (RESP) – selects restricted or unrestricted RIO link

response time.

• Last Chassis/PLC-3 Backup (LAST CHA) – When the 1747-ASB module is

used with a PLC-2 or PLC-5, this switch indicates to the scanner that the

1747-ASB module is the last adapter mapped into the 1747-ASB module’s

highest logical rack. When using a PLC-3 processor, the switch determines

whether the 1747-ASB module supports the PLC-3 backup function.

• Addressing Mode (ADDR MODE) – determines the 1747-ASB module’s

remote chassis and remote expansion chassis addressing mode. 2-slot,

1-slot, and 1/2-slot are available.

• Specialty I/O Mode (SP MODE) – determines whether the 1747-ASB

module discretely maps or block transfer maps specialty I/O modules in its

remote chassis and remote expansion chassis.

• I/O Module Keying (KEY) – determines if the 1747-ASB module saves its

current I/O module and DIP switch configuration to its non-volatile memory,

or if the 1747-ASB module compares the current I/O module and DIP switch

configuration to the one saved in its non-volatile memory.

1747-ASB Module Overview

The 1747-ASB module is an SLC 500 single-slot, RIO communication link module. It

occupies the first slot (slot 0) of a 1746 remote chassis, where the SLC processor

normally resides.

The 1747-ASB module is an adapter, or slave, on the RIO link, and the master of the

remote chassis and remote expansion chassis in which it is installed. Remote

expansion chassis are optional. The module acts as a gateway between the scanner

and the I/O modules residing in the remote chassis and remote expansion chassis.

It maps the image of the I/O modules in its remote chassis and remote expansion

chassis directly to the SLC or PLC processor image.

Output data is sent from the scanner of either the SLC or PLC local chassis to the

1747-ASB module across the RIO link. This data is automatically transferred to the

output modules across the chassis backplane by the 1747-ASB module. Inputs from

the input modules are collected via the backplane by the 1747-ASB module and

sent back to the scanner across the RIO link. No user programming of the 1747-ASB

module is necessary.

The adapter reads the network address switches first to determine if the

switches are set to a valid number. You set the node address by using the

network address switches. Valid settings range from 001…254.

When the switches are set to a valid number, the adapter’s IP address is

192.168.1.xxx (where xxx represents the number set on the switches).

The adapter’s subnet mask is 255.255.255.0 and the gateway address is set to

0.0.0.0. The adapter does not have a host name assigned, or use any Domain

Name System when using the network address switch settings.

If the switches are set to an invalid number (for example, 000 or a value greater

than 254 excluding 888), the adapter checks to see if DHCP is enabled. Setting

the switches to 888 restores default factory settings.

IMPORTANT If you set the value of the adapter switch to 888 and then power cycle

the module, the following occurs:

• The DHCP Enabled function is enabled (set to True).

• The Ethernet link is negotiated automatically. The Auto Negotiate

function is set to True.

• The web server is enabled. The Disabled Web Server function is

disabled.

• The Ethernet ports are disabled. Both ports are re-enabled once the

switches are returned to their previous value and power is cycled.

Diagnostic Indicators The module has the following diagnostic indicators:

• Link 1 and Link 2 status indicator

• Module indicator

• 4-character status display

What the Adapter Does The 1747-AENTR EtherNet/IP adapter performs the following primary tasks:

• Control of real-time I/O data (also known as implicit messaging) – the

adapter serves as a bridge between I/O modules and the network

• Support of messaging data for configuration and programming

information (also known as explicit messaging)

Use of the Common

Industrial Protocol (CIP)

The adapter uses the Common Industrial Protocol (CIP), the application layer

protocol specified for EtherNet/IP, the Ethernet Industrial Protocol. It is a

message-based protocol that implements a relative path to send a message

from the producing device in a system to the consuming devices.

The producing device contains the path information that steers the message

along the proper route to reach its consumers. Since the producing device

holds this information, other devices along the path simply pass this

information; they do not store it.

This has the following significant benefits:

• You do not need to configure routing tables in the bridging modules,

which greatly simplifies maintenance and module replacement.

• You maintain full control over the route taken by each message, which

enables you to select alternative paths for the same end device.

Minimizing Interference

from Radiated Electrical

Noise

Important: Signals in this type of control system are very susceptible

to radiated electrical noise. The module is designed to set the loss-ofsensor

bit I:e.0/8 and the LDT-error bit I:e.0/0 when it detects position

values that are lost or corrupted by electrical noise.

Connect module output terminals to output devices with correct bonding:

• connect power supply output commons together

• electrically isolate power supply output commons from earth ground

• use bond wires that are equal in size to signal wires

Minimize interference from radiated electrical noise with correct

shielding and grounding:

• connect all of the following to earth ground:

– LDT flange, frame, and machine

– I/O chassis

– protective ground

– AC ground

– cable shields at one end only, preferably with 3/8” braid wire

(for analog output, ±15V dc PS, 24V dc PS, and LDT)

– terminal 4 of the input terminal block

• run shielded cables only in low-voltage conduit

• place the SLC-500 processor, power supply, and I/O chassis

assembly in a suitable enclosure