User Manual

PD42-x-1241 Hardware Manual • Hardware Version V1.00 | Document Revision V1.23 • 2019-JAN-02
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c:>
node
1
node
n
- 1
node
n
Host
Slave Slave Slave
CAN
termination
resistor
(120 Ohm)
termination
resistor
(120 Ohm)
}
keep distance as
short as possible
Figure 14: CAN bus structure with termination resistors
2. BUS TERMINATION:
Especially for longer busses and/or multiple nodes connected to the bus and/or high communication
speeds, the bus should be properly terminated at both ends. The PD42-x-1241 does not integrate
any termination resistor. Therefore, 120 Ohm termination resistors at both ends of the bus have to
be added externally.
3. BUS TERMINATION:
The bus transceiver used on the PD42-x-1241 units (TJA1051T) supports at least 110 nodes under
optimum conditions. Practically achievable number of nodes per CAN bus highly depend on bus
length (longer bus -> less nodes) and communication speed (higher speed -> less nodes).
9 Motor driver current
The on-board stepper motor driver operates current controlled. The driver current may be programmed
in software with 32 effective scaling steps in hardware.
Explanation of different columns in table below:
Motor current set-
ting in software
(TMCL)
These are the values for TMCL axis parameter 6 (motor run current) and
7 (motor standby current). They are used to set the run / standby current
using the following TMCL commands:
SAP 6, 0, <value> // set run current
SAP 7, 0, <value> // set standby current
(read-out value with GAP instead of SAP. Please see separate PD42-x-1241
firmware manual for further information)
Motor current I
RMS
[A]
Resulting motor current based on motor current setting
Motor Current Setting
Motor current setting
in software (TMCL)
Current scaling step
(CS)
Motor current I
COIL
[A]
peak
Motor current I
COIL
[A]
RMS
0. . . 7 0 0.135 0.096
8. . . 15 1 0.271 0.192
16. . . 23 2 0.406 0.287
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