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02
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Commands
7.4.10
Heartbeat and ident status
If instance 112d and 162d of the assembly object are selected, the size of the output field is 0
bytes and the size of the input that contains the status and reply counter is 10 bytes.
The advantage of this procedure is that only a few data bytes are transferred via the bus. Ident
commands are transferred as the ident system as explicit commands. A new ident response
can be read as soon as the value on the reply counter changes.
7.4.11
Data hold time
All responses from the device are present in the input field for a specific time. Make sure that
the controller reads all responses before they are overwritten by a new response. The data hold
time indicates how long an ident telegram of this kind remains in the input field. The data hold
time can be adjusted via the display or the boot-up object. Values between 0 and 2.55 seconds
can be preset in 10 ms increments. The default value is 100 ms. Make sure that the data hold
time is greater than the maximum cycle time of the whole system (including data storage to the
PLC). However, the data hold time should not be much longer than necessary for the following
reasons:
1. The reaction time of the device will increase if several responses arrive in quick succes-
sion.
2. The maximum possible number of response telegrams per time unit decreases when the
data hold time is increased. A memory overflow may occur. The State LED then flashes
green.
7.4.12
PCCC
PLC5 and SLC500 PLCs use PCCC messaging. The identification system also supports
PCCC. The data telegrams receive the output and input data from the selected assembly
object. Note the byte sequence here (see "Example: Assembly instance 104, single read
Supported PCCC commands:
■
Write PLC5 type point-to-point
■
Read PLC5 type point-to-point
The data is always written as an integer data set starting with N14:0. The data is read as an
integer data set starting with N7:0. The length is determined by the assembly instance selected
via the display on the Ident Control.
Byte status
Description
00
Status of the IDENTControl
01
Reply counter of the IDENTControl
02
Status of channel 1
03
Reply counter from channel 1
04
Status of channel 2
05
Reply counter from channel 2
06
Status of channel 3
07
Reply counter from channel 3
08
Status of channel 4
09
Reply counter from channel 4
Table 7.19
Description of the status byte