Rockwell Automation 1792D-4BVOD ArmorBlock MaXum 4 Input Module Series B User Manual

Page 8

8 ArmorBlock MaXum 4 Input Module Series B

Publication 1792D-IN017B-EN-P - September 2000

Polled - a master initiates communication by sending its polled I/O
message to the module. The 4 input module scans the inputs and
fault bits producing a response that reflects their status.

Change-of-state - productions occur when an input changes or a
fault condition occurs. If no input or fault condition change occurs
within the expected packet rate, a heartbeat production occurs. This
heartbeat production tells the scanner module that the module is alive
and ready to communicate.

Refer to the table below for the word/bit definitions.

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Bit

Produces 0

ISC-D

ISC-C

ISC-B

ISC-A

Produces 1

RSVD

OW-D

OW-C

OW-B

OW-A

Where: OW = Off Wire I = Input ISC = Input Short Circuit in Sensor Source

Voltage RSVD = Reserved

Byte

Bit

Description

Produces 0

00-03

04-07

Input status bits: When the bit is set (1), the input is on. Bit 00
= input 0, bit 01= input 1, bit 02 = input 2, bit 03 = input 3.
Sensor source voltage, input short circuit (ISC): Fault bits are
set (1) when the sensor source voltage is faulted. Bit 00 =
ISC-A on connector A, bit 01 = ISC-B on connector B, bit 02 =
ISC-C on connector C, bit 03 = ISC-D on connector D.

Produces 1

00-03

04-07

Off-Wire fault (OW): Bit 00 = OW-A on connector A, bit 01 =
OW-B on connector B, bit 02 = OW-C on connector C, bit 03 =
OW-D on connector D.
Reserved