Sel 751A - 06 H Preset Single Register Command; Table E.15 Responses to 05 H Force Single Coil Query Errors

E.13
Date Code 20100129 Instruction Manual SEL-751A Relay
Modbus RTU Communications
Communications Protocol
Coil addresses start at 0000 (i.e., Coil 1 is located at Coil address 0000). If the
device is disabled or the breaker jumper is not installed, it will respond with
error code 4 (Device Error). In addition to Error Code 4, the device responses
to errors in the query are shown in Table E.15.
06h Preset Single
Register Command
The SEL-751A uses this function to allow a Modbus master to write directly
to a database register. Refer to the Modbus Register Map in Table E.32 for a
list of registers that can be written by using this function code. If you are
accustomed to 4X references with this function code, for six-digit addressing,
add 400001 to the standard database addresses.
In Tabl e E.16 , the command response is identical to the command required by
the master.
74 01, 05 Pulse RB16
a
75 01, 05 Pulse RB17
a
76 01, 05 Pulse RB18
a
77 01, 05 Pulse RB19
a
78 01, 05 Pulse RB20
a
79 01, 05 Pulse RB21
a
80 01, 05 Pulse RB22
a
81 01, 05 Pulse RB23
a
82 01, 05 Pulse RB24
a
83 01, 05 Pulse RB25
a
84 01, 05 Pulse RB26
a
85 01, 05 Pulse RB27
a
86 01, 05 Pulse RB28
a
87 01, 05 Pulse RB29
a
88 01, 05 Pulse RB30
a
89 01, 05 Pulse RB31
a
90 01, 05 Pulse RB32
a
a
Pulsing a Set remote bit will cause the remote bit to be cleared at the end of the pulse
(1 SEL
OGIC Processing Interval).
Table E.15 Responses to 05h Force Single Coil Query Errors
Error Error Code Returned
Communication Counter
Increments
Invalid bit (coil) Illegal Data Address (02h) Invalid Address
Invalid bit state requested Illegal Data Value (03h) Illegal Register
Format Error Illegal Data Value (03h) Bad Packet Format
Table E.14 01h, 05h SEL-751A Output (Sheet 4 of 4)
Coil Address (Decimal) Function Code Supported Coil Description