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Data Communication with the CM35
Layout of the
control word
Table 4-2
Allocation of the control word for parameterization
Bit
Address
0 to 3
Identifier
for the set operating mode
4 to 5
Number
of the current parameter block
6
Consistency bit
- - Only with parameterization via
direct I/O accesses
- - Not applicable for parameterization
via SFC 55
7
Start/stop byte enable
4-4
The control word is the first word of each parameter block. The layout of the
control word is shown below.
The bit numbering is specified for the data type ²word.²
- - The low byte of word ²n² has the byte address ²n + 1.²
- - The high byte of word ²n² has the byte address ²n.²
Byte n
Start/stop byte
15
14
13
12
11 10 9 8 7
X
X
X
X
X = Disregard
Table 4- - 2 shows the permissible allocations of the control word.
Description
Byte n+1
Coordination byte
6
5 4 3 2 1 0
0
Parameter block number
Consistency bit
Start/stop byte enable
Parameter block subnumber
Allocation
0001:
Pulse counter operating mode
0010:
Period duration measurement
operating mode
0011:
Timer operating mode
0100:
Positioning operating mode
01:
Parameter block 1
10:
Parameter block 2
11:
Parameter block 3
0:
Write parameter block
1:
Accept parameter block via CM35
0:
Evaluate parameter data
1:
Evaluate start/stop byte
(4) J31069-D0416-U001-A5-7618
Operating mode
CM35 Counter Module
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