Item No. 2 539 042, 3070901HO
Operating parameters (DDLM_Set_Prm)
Parameter
Data type
Parameter
Class
Default values according to GSD file
Octet number
Station status
Octet string
1
DIN 19245-3
88h
Response check time (T
WD
)
16 bit
2 - 3
DIN 19245-3
340 ms
Min. station delay responder (min. T
SDR
)
Octet string
4
DIN 19245-3
11
PNO-Ident-Number
16 bit
5 - 6
DIN 19245-3
00B7h
Group-Ident
Octet string
7
DIN 19245-3
0
Code sequence
Bit 0
9
1
0 = ascending for cw rotation
Class 2 functionality
Bit 1
9
2
1 = On
Maintenance diagnosis
Bit 2
9
optional
0 = Off
Scaling function
Bit 3
9
2
1 = On
Sampling
Bit 7
9
2
0 = 1 ms
Measuring steps per turn
32 bit
10 - 13
2
4,096 (12 bit)
Total number of measuring steps
32 bit
14 - 17
2
67,108,864 (26 bit)
Data exchange (DDLM_Data_Exchange)
Data exchange is configured by the DDLM_Chk_Cfg routine
(see Configuration).
Position value
The encoder input data – with a 32 bit length (also with 64 bit, depending on
the manufacturer) – are used for the position value (with 64 bit, speed and
acceleration in addition). Optionally, the encoder also supports position
values with a 16 bit length. In the data field, the value is right-adjust.
Preset function
The preset function supports adaptation of the encoder zero to the mechani-
cal system zero. It sets the actual encoder position value to the preset value.
By the Data_Exchange function, the preset value is stored as a base value.
The preset function is used according to the scaling, i.e., the preset value is
given by the programmed measuring steps.
Configuration (DDLM_Chk_Cfg)
By this routine, the DP master defines the number of bytes for data exchange.
Octet
Bit
Data
Function
1
7 - 0
D1h = 2 words of input data (standard configuration)32 bit position value
(class 1)
F1h = 2 words of input data, output data (standard configuration)32 bit position value / Preset
(class 2)
D0h = 1 word of input data (optional configuration)16 bit position value
(class 1)
F0h = 1 word of input data, output data (optional configuration)16 bit position value / Preset
(class 2)
D3h = 4 words of input data (manufacturer configuration)Position value+speed+acceleration
F3h = 4 words of input data, 4 words of output data (manufacturer configuration)Position value+speed+acceleration / Preset
Data exchange (DDLM_Data_Exchange)
The
preset value MSB
controls the preset function as follows:
Normal operation state:
MSB = 0
(
Bit 31
, optionally Bit 15 or Bit 63)
Preset value will
not
be accepted.
Preset-Mode:
MSB = 1
(
Bit 31,
optionally Bit 15 or Bit 63)
With MSB=1, the encoder accepts the trans
mitted value (Bit 0 … 30) as binary-coded
preset value.
The encoder reads the actual position value, calculating an offset value from
the preset value and the read-in position value. The position value is replaced
by the preset value. If the base value is identical with the preset value, the
preset mode will be terminated and the master can set the MSB to zero. The
offset value can be read by the diagnostic function. The value will be reload-
ed after a mains failure and with each restart.
The preset function must only be used at encoder standstill.
The scaling parameters must be transferred in advance
(only if scaling is to be set).
Subject to technical modifications and improvements serving the progress of our devices.
Installation instructions
Absolute Shaft Encoder
RX70TPRX /RX 71TP
with PROFIBUS-DP
Page 7/8
