Instruction Manual

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 83
Module Configuration, Output, and Input Data Chapter 4
Storage Mode (CtrnConfig.StorageMode_0 through
Ctr
nConfig.StorageMode_2)
These three bits apply to Counters 0 and 1 only. They define how the module
interprets the Z input, as shown below. Each bit works independently. If bit 0 and
bit 2 are set simultaneously, a Z event causes the Current Count Value to be
stored and then preset.
Linear (Ctr0Config.Linear through Ctr3Config.Linear)
This bit indicates how the counter operates upon reaching a CtrnMinCount or
CtrnMaxCount.
• 0 = Ring Counter
• 1 = Linear Counter
See
page 28 for a description of ring and linear counter operation.
Set bit For function
CtrnConfig.StorageMode_0 Stores the Current Count Value on the rising edge of Z to
Ctr[n].StoredCount in the input file.
CtrnConfig.StorageMode_1 Holds the counter at its Current Count Value whileZ=1.
CtrnConfig.StorageMode_2 Presets the Current Count Value on the rising edge of Z.
IMPORTANT
Z = internal Z. Internal Z is the version of the Z input pin as modified by
the output array control bits Z Invert and Z Inhibit.
TIP
The Ctr1Config.Storage Mode bits are reserved if NumberofCounters_1
and NumberofCounters_0 are set to 00 (one counter). Attempting to set
reserved bits will result in a configuration error.
IMPORTANT
Do not change this value while the counter is enabled. Attempting to do
so will result in a BadModConfigUpdate error. See page 120 for a list
of prohibited settings.
IMPORTANT
Do not change this value while the counter is enabled. Attempting to do
so will result in a BadModConfigUpdate error. See page 120 for a list of
prohibited settings.