Read Holding Register Access Log (H46 or 70) - PENN Controls - VFD68Bxx - VFD68Cxx - VFD68Dxx - Three‐Phase Motor Speed Controller - VFD68 Three‐Phase Variable Frequency Drive

VFD68 Variable Frequency Drives Technical Bulletin

Brand
PENN Controls
Product name
VFD68 Three‐Phase Variable Frequency Drive
Document type
Technical Bulletin
Part number
24-7664-3051
Document revision
C
Revision date
2019-08-09
Language
English

A response can be made to a query made by the function code H03 or H10. The starting address of the holding registers that succeed in access during previous communication are returned. Also, the number of successful registers are returned. In response to the query for other than the above function code, 0 is returned for the address and number of registers.

Table 1. Query Message
Subordinate Address Function CRC Check
(8 bit) H46 (8 bit) L (8 bit) H (8 bit)
Table 2. Normal Response (Response Message)
Subordinate Address Function Starting Address Number of Points CRC Check
(8 bit) H46 (8 bit) H (8 bit) L (8 bit) H (8 bit) L (8 bit) L (8 bit) H (8 bit)
Table 3. Query Message Setting
Message Setting Description
Subordinate Address Address to which the message is sent. Broadcast communication cannot be made: 0 is an invalid setting.
Function Set H46
Table 4. Normal Response Message to Query
Message Setting Description
Starting Address The starting address of the holding registers that succeeded is returned.

Starting address = starting register address (decimal) - 40001

For example, when the starting address 0001 is returned, the address of the holding register that succeeded in access if 40002.

Number of Points The number of holding registers that succeeded in access is returned