Rockwell Automation 1734-IK Encoder/Counter Modules User Manual - Manual (Page 29)

Publication 1734-UM006B-EN-P - August 2005
Install the Module 2-9
Communicate with Your
Module POINT I/O modules send (consume) and receive (produce) I/O
messages. You map these messages into the processor’s memory.
This module produces 6 or 10 bytes of input data (scanner Rx)
(status). It consumes 1 byte of I/O data (scanner Tx). Use parameters
11 and 12 to select assembly 101, 102, or 103 for data produced by the
module.
When you send a configuration to the module, you check it for
consistency before applying it. Monitor the PE bit with your user
program to isolate any problems with an improperly configured
module. If the configuration is acceptable, the counter ASIC is
disabled while the ASIC is loaded with new operational parameters.
Outputs can turn off during this reconfiguration.
Message size:
Default Data Map
Message size: 6 or 10 Bytes
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Produces
(scanner Rx) Channel 0 value of present counter state (LSW)
Channel 0 value of present counter state (MSW)
P
E E
F N
R
0 0 0 0 0 0 Z
S B
S A
S C
1 C
0 Z
D
0
Where:PE = Programming error
EF = EEPROM fault status
NR = Not ready status bit
ZS = Z input status
BS = B input status
AS = A input status
C1/C0 = Stored data count
ZD = Zero frequency detected
LSW = Least significant word
MSW= Most significant word
07 06 05 04 03 02 01 00
Consumes (scanner Tx) 0 0 0 0 0 VR CP CR
Where:VR = Value reset of stored/accumulated count
CP = Counter preset
CR = Counter reset