Protocol Specifications - Omron SYSMAC CS1W-SCB41-V1 Operation Manual

Specifications
1-6-3

Protocol Specifications

Host Link Specifications
Item
Communications mode Half-duplex (Full-duplex for slave-initiated communications)
Synchronous mode
Baud rate (see note 1)
Communications
distance (see note 1)
Connection
configuration
Number of connected
Units
Frame structure
Error check codes
Command flow and
support
Note
26
Start-stop synchronization (asynchronous mode)
RS-232C port and RS-422A/485 ports:
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps
Default setting: 9,600 bps
RS-232C port: 15 m max. (see note 2)
RS-442A/485 port: 500 m max. (The total combined cable length is 500 m max. T-branch lines
must be a maximum of 10 m long.)
RS-232C port: 1:1 (1:N (N = 32 Units max.) is possible using an Converting Link Adapters.)
RS-422A/485 port: 1:N (N = 32 Units max.)
32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)
C-mode Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
commands code + text, error check code: FCS, terminator: *+CR
FINS Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
commands code (always "FA") + FINS header + FINS command + text, error check
code: FCS, terminator: *+CR
Vertical parity: Even, odd. or none
FCS (horizontal parity converted to ASCII)
Command flow Commands
Host computer C-mode commands
to PLC
FINS commands (in
Host Link protocol)
PLC to host FINS commands (in
computer Host Link protocol)
1. Confirm the baud rates and communications distance supported by con-
nected devices.
2. The maximum cable length for RS-232C is 15 m. The RS-232C standard,
however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.
Description
Contents
1:1 or 1:N communications with directly connected
PLCs (The specified frame format must be prepared
on the host computer and then sent.)
1:1 or 1:N communications with directly connected
PLCs.
Communications using SEND(090), RECV(098),
and CMND(490) from CPU Unit.
The host computer must interpret the commands
and return a response in the correct format.
Connection between the host computer and PLC
must be 1:1.
Section 1-6