Hengstler RX70TP Installationsanleitung Seite 7

Installation instructions
Absolute Shaft Encoder
RX70TPRX /RX 71TP
with PROFIBUS-DP
Configuration (DDLM_Chk_Cfg)
By this routine, the DP master defines the number of bytes for data exchange.
Octet Bit Data
1 7 - 0 D1h = 2 words of input data (standard configuration)
F1h = 2 words of input data, output data (standard configuration)
D0h = 1 word of input data (optional configuration)
F0h = 1 word of input data, output data (optional configuration)
D3h = 4 words of input data (manufacturer configuration)
F3h = 4 words of input data, 4 words of output data (manufacturer configuration)
Operating parameters (DDLM_Set_Prm)
Parameter
Station status
Response check time (T )
WD
Min. station delay responder (min. T
PNO-Ident-Number
Group-Ident
Code sequence
Class 2 functionality
Maintenance diagnosis
Scaling function
Sampling
Measuring steps per turn
Total number of measuring steps
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.
Data type
Octet string
16 bit
) Octet string
SDR
16 bit
Octet string
Bit 0
Bit 1
Bit 2
Bit 3
Bit 7
32 bit
32 bit
Subject to technical modifications and improvements serving the progress of our devices.
Page 7/8
Parameter
Octet number
1 DIN 19245-3
2 - 3 DIN 19245-3
4 DIN 19245-3
5 - 6 DIN 19245-3
7 DIN 19245-3
9
9
9 optional
9
9
10 - 13
14 - 17
Data exchange (DDLM_Data_Exchange)
The preset value MSB controls the preset function as follows:
Normal operation state:
Preset-Mode:
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).
Function
32 bit position value
32 bit position value / Preset
16 bit position value
16 bit position value / Preset
Position value+speed+acceleration
Position value+speed+acceleration / Preset
Class Default values according to GSD file
88h
340 ms
11
00B7h
0
1 0 = ascending for cw rotation
2 1 = On
0 = Off
2 1 = On
2 0 = 1 ms
2 4,096 (12 bit)
2 67,108,864 (26 bit)
MSB = 0 (Bit 31, optionally Bit 15 or Bit 63)
Preset value will not be accepted.
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.
(class 1)
(class 2)
(class 1)
(class 2)