Cv-Mode Command/Response Format - Omron SYSMAC LINK C1000H-SLK21-V1 System Manual

CV-mode Command/Response Format

Example
6-3

CV-mode Command/Response Format

Command Format
Response Format
86
Note 1. When the data link is halted. Refer to 5-10-1 Data Link Communications
Cycle Time for details on the communications cycle time when the data link
is operating.
2. The I/O response time might increase due to noise or restrictions on the
number of frames that can be transmitted while the data link is operating.
In this example, the maximum transmission delay is calculated for an instruction
receiving 256 words of data in a system with 32 nodes. Network specifics are
detailed below:
Max. node number:
Number of nodes:
Number of polled units: 4
Number of words:
Communications:
Data link:
Delay cause
LINK Unit servicing
Transmission processing (command)
Reception processing (command)
Communications cycle time (× 2)
Transmission processing (response)
Reception processing (response)
The maximum transmission delay is thus:
(PC scan time × 3) + 40.74 ms.
This section describes the format of commands that can be received from com-
puters or CV-series PCs and the responses that are returned. C-series SYS-
MAC LINK Units (except models C1000H-SLK21 and C200H-SLK21) can
receive CV-mode (FINS) commands, but cannot transmit commands in this
command/response format because they are not equipped with a COMMAND
instruction (CMND(194) in CV-series PCs).
Unless another format is specifically indicated, all commands and responses
are in hexadecimal. Commands that are sent to the PC CPU Unit differ from
those that are sent to the SYSMAC LINK Unit.
Commands have the following format:
2 bytes
Command
code
Responses have the following format:
2 bytes 2 bytes
01 01
Command Response
code code
32
32
256
coaxial cable
halted
PC scan time
5 ms
5 ms
7.042 ms (× 2)
8.328 ms
8.328 ms
540 bytes max.
Data
538 bytes max.
Data
Section 6-3
Maximum delay (ms)