8
Protocol for hot-runner systems
Selecting the hot-runner protocol is done via setting
ProT
= 2 .
With a hot-runner system, KS 50-1
TCont
covers one channel.
8.1
Master telegram
The structure of the inquiry telegram is:
...4
5
6
...
10
11+12
...
Identification
Message
Checksum
Byte 5:
Identification:
41h
(‚A‘) is supported.
Byte 6-9:
•
Set-point with command for closed-loop control: (=
SP
) in 0,1
°
C
(3 digits before, 1 digit behind the decimal point);
Negative temperatures up to –99
°
C are possible (1
st
byte = 2dh)
•
Output value with command for positioning: in % (=
Yman
)
(3 digits before, 1 digit behind the decimal point)
Byte 10:
Control commands
72h (r)
: closed-loop control (normal operation),
in °C; instrument in automatic mode;
after control function switch-off, self-tuning is done,
if permitted
73h (s)
: positioning,
in %; instrument in manual mode
61h (a)
: switch off channel
control function switched off
Byte 11-12:
Checksum
g
Special case: first message after control system start-up: system can read up to 25
channels per device address. Therefore, the message contains up to 25 times the
set-point or output value, and the control command.
However, a KS 50-1
TCont
only uses the values for channel 1 from the message,
and indicates in the reply that only one channel is provided.
Protocol for hot-runner systems
Master telegram
20
Operating note KS 50-1
TCont
