Register Remap Function - Toshiba VF-A7 Instruction Manual

Table 2 : Example Status Word (ASD Register 0xFE01) Format
Bit
15 Reserved
14 Faulted status
13 Reserved
12 Reserved
11 Reserved
10 Run / stop status
9 Forward / reverse status
8 Jog status
7 DC injection braking status
6 Accel / decel #1/#2 status
5 Reserved
4 Reserved
3 Reserved
2 Reserved
1 Reserved
0 Reserved

10.4 Register Remap Function

Some Modbus client software does not allow access to more than 10,000 Modbus
holding registers. As the standard ETH-100 mapping provides a simple 1-to-1
correspondence between Modbus holding registers and ASD registers (ASD register
number + 1 = Modbus holding register number), this can cause certain critical ASD
registers to be inaccessible from these clients. Specifically, Toshiba drives typically
place communication control registers and status registers in the 0xFAxx to 0xFFxx
ASD register region. For example, "Communication Frequency Command" is
typically assigned to ASD register number 0xFA01, which is accessible via Modbus
holding register 0xFA01 + 1 = 0xFA02, which is 64002 in decimal. As this Modbus
holding register number is higher than 10,000, this register would not be accessible
via register-limited clients unless the ETH-100 performed register remapping.
"Remap OFF" (default setting) does not modify the register mapping between the
ASD registers and the Modbus holding registers: a simple 1-to-1 correspondence
exists. "Remap ON" modifies the ASD register mapping slightly to allow access to
the drive's critical control and status registers by Modbus clients that are limited to
accessing 10,000 holding registers max.
With the Remap parameter set to "ON", the ETH-100 will add 0xF000 (61440
incoming ASD register accesses between 0x0A00 and 0x0FFF (Modbus holding
registers 0x0A01 – 0x1000). In this way, register-limited clients need only write to
Modbus holding register 0x0A02 (2562
Command. Similarly, "Current Output Frequency" is typically located at ASD register
Function
) to set the Communication Frequency
10
0
Not faulted
Stopped
Forward
Not jogging
Not DC injection
braking
#1
29
1
--
Faulted
--
--
--
Running
Reverse
Jogging
DC injection
braking
#2
--
--
--
--
--
--
) to
10