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Chapter 5 Instruction specifications
5-123
(6) "t" parameter
: Set by user[0][1][2][3][4][5][6][7][8][9][A][B]
tt+B
[0] Execution bit:
Set "1" by user program to send data. This bit is reset after communication completed.
[1] Communication completed :
This bit is set "1" when communication completed without error, and reset at communication starting.
[2] Communication failed :
This bit is set "1" when communication fails, and reset at communication starting.
[3] Initialize :
Set "1" by user program to initialize RECV 0 command. If this bit is on while communication, the communication
is forced to be stopped.
[4] Initialize completed :
This bit is set "1" when initializing completed without error. Initialize bit [3] is reset at this timing.
[5] Send enabled :
Set "1" by user program if CPU needs to send data after data receiving. This bit is reset after communication
completed.
[6] Parity error flag :
This bit is set "1" when parity error detected.
[7] Framing error :
This bit is set "1" when framing error detected.
[8] Overrun error :
This bit is set "1" when overrun error detected.
[9] Timeout :
This bit is set "1" when timeout detected.
[A] Input buffer full :
This bit is set "1" when input buffer full
[B] Conflict error :
This bit is set "1" when TRNS 0 or RECV 0 commands are duplicated.
Bit [6] to [B] is reset at initializing and RECV 0 executed.
(7) Sending/receiving data format (See TRNS 0 command)
Caution
z
Be sure to switch port type at first from dedicated port to general purpose port by FUN 5 command in user program.
z
If CPU receives data by RECV command after data sending, sent data could be failed depending on timing. In such a case,
RECV command with "send enabled" is recommended.
z
No contact nor condition is allowed to use with RECV 0 command.
z
Be sure to set [0] Execution bit high in 2
nd
scan or later. (Not in 1
st
scan)
z
If parameter setting is wrong, error code H52 (TRNS/RECV command error) is set in WRF000 in some cases.
z
ER signal is set on in the following condition.
Communication executed properly.
z
ER signal is set off in the following condition.
- Initialized bit being set "1" while communication.
- CPU status changed RUN→STOP→RUN while communication
- Timeout while communication.
- s, t parameters overwritten and range error while communication.
RECV 0 (d, s, t)