APS 6RL Series, Operation Manual

Page: 123 / 204

6RL SERIES OPERATION MANUAL
SECTION 7: REMOTE PROGRAMMING
Entire Contents Copyright
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2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual Page 123 of 204
Data Type
Following data types are used.
Data type Length
char 1 Byte Single byte, used for strings
uint(8) 1 Byte Single byte
uint(16) 2 Bytes Double byte, also called word or 16bit integer
uint(32) 4 Bytes Double word, also called long or 32bit integer
float 4 Bytes Floating point value according to IEEE745 standard
Access
This column defines for every register whether the access is read only, write only or
read/write.
R = Register is read only
W = Register is write only resp. would not return a reasonable value when read from
RW = Register can be read or written
It applies generally: Writing to a register, which allows write) access (W, RW) is only possible
during remote control!
Number of registers
With ModBus, a register always has a length of 2 bytes or a multiple of 2 bytes. This column
tells how many 2-byte values are used by the register. The value is always half that of the
value in column “Data length in bytes”.
Data
This column tells additional information about the data which can be written to or read
from the register. Two, four or more bytes can be interpreted in different ways, depending
on data type and content.
Profibus/Profinet slot & index
These columns (where available) are used by Profibus/Profinet users to link the registers in
the register list via two values “index” and “slot” to data blocks (SFBs) in the PLC software.
While “index“ is a direct parameter for the data block, the value “slot“ has to be used to find
the address of a slot, which is variable, in order to get the parameter “ID“. For more see
section 7.13, “Profibus & Profinet” on page 171.
EtherCAT SDO/PDO?
This column is only available in register lists for those models which support the EtherCAT
interface.
The column marks which of the generally per unit available ModBus registers can be
accessed by the CANopen over Ethernet (CoE) protocol in form of indexes. Some of the
marked registers are connected to PDOs, the rest is connected as SDOs. Units supporting
the EtherCAT interface contain a downloadable data object list. Which of the registers
connect to PDOs is described in the EtherCat section of this manual.