133
Communications Timing Section 4-4
4-4-2 Communications Control Signals and Communications Timing
If CTS control is enabled in the Setup Area, the RTS output signal will be
turned ON from the Board or Unit and the send process will go on standby
until the CTS input signal turns ON. Either release this busy status by incorpo-
rating the RTS output signal for the CTS input signal at the host computer, or
loop the RTS output signal back to the CTS input signal at the Unit or Board.
Note The status of the RTS and CTS signals can be confirmed in the Transmission
Control Signal Status in the Status Area. Refer to page 130.
4-4-3 Flags for Network Communications
This section describes the flags in the Auxiliary Area that are used when exe-
cuting SEND(090), RECV(098), and CMND(490).
Communications Port
Enabled Flags
A Communications Port Enabled Flag turns ON when SEND(090),
RECV(098), and CMND(490) can be executed. The flag will turn OFF during
execution of these commands and turn ON again when the command execu-
tion is completed. When creating the ladder diagram, use these flags as input
conditions when executing these instructions.
Communications Port
Error Flags
A Communications Port Error Flag will turn ON in the following cases.
• When an error is generated during execution of SEND(090), RECV(098),
or CMND(490).
• When an error response or retry error has been generated for the port.
These Flags will turn OFF when the corresponding Communications Port
Enabled Flag is turned OFF at the start of operation or at the start of execut-
ing the SEND(090), RECV(098), or CMND(490).
Communications Port
Completion Codes
The Communications Port Completion Code words will contain the FINS end
code after SEND(090), RECV(098), or CMND(490) has been executed.
Word Bit Content
A202 08 to 15 Reserved
07 Communications Port Enabled Flag, Port No. 7
06 Communications Port Enabled Flag, Port No. 6
05 Communications Port Enabled Flag, Port No. 5
04 Communications Port Enabled Flag, Port No. 4
03 Communications Port Enabled Flag, Port No. 3
02 Communications Port Enabled Flag, Port No. 2
01 Communications Port Enabled Flag, Port No. 1
00 Communications Port Enabled Flag, Port No. 0
Word Bit Content
A219 08 to 15 Reserved
07 Communications Port Error Flag, Port No. 7
06 Communications Port Error Flag, Port No. 6
05 Communications Port Error Flag, Port No. 5
04 Communications Port Error Flag, Port No. 4
03 Communications Port Error Flag, Port No. 3
02 Communications Port Error Flag, Port No. 2
01 Communications Port Error Flag, Port No. 1
00 Communications Port Error Flag, Port No. 0
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