User guide

Communication Access Registers
870 USE 103 00 May 2001 41
Status Registers
Overview This section describes the function and parameters of the module status block and
the ASCII header block.
Module Status
Block Function
These registers provide information about the module’s revision level and current
operating parameters.
Module Status
Block
Parameters
The module status block layout is described in the table below. The registers can
be read, but cannot be written into.
Reference
(hex)
Purpose Contents
4F801 Length of status block (words) 12 decimal
4F802 I/O module quantity of input bytes Module dependent
4F803 I/O module quantity of output
bytes
Module dependent
4F804 I/O module ID number Module dependent
4F805 I/O module revision number Format: XRwhere:X = upper 4 bits,
always 0000R = lower 12 bits, defining the
revision as 3 hex characters.Example:
100 hex = Rev. 1.00 200 hex = Rev. 2.00
4F806 ASCII header block length (words) Module dependent
4F807 Last node address to
communicate
1...64 decimal
4F808 Remaining ownership reservation
time
30...6000 decimal, in units of 10 ms (300
ms...60 s)
4F809 Remaining outputs holdup time 30...6000 decimal, in units of 10 ms (300
ms...60 s)
4F80A I/O module health 8000 hex = healthy0000 hex = not healthy
4F80B I/O module last error value Module dependent
4F80B I/O module error counter Error count 0000...FFFF hex