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20 SERIAL COMMUNICATION INSTRUCTIONS
20.1 Sending Data Using the On-Demand Function
■Applicable devices
*1 Index modification is not available.
*2 FX and FY cannot be used.
*3 RD cannot be used.
*4 FD cannot be used.
*5 T, ST, C, and FD cannot be used.
■Control data
*1 The amount of send data must be set in units as specified in the engineering tool. For word specification, set the number of words. For
byte specification, set the number of bytes.
Operand Bit Word Double word Indirect
specification
Constant Others
(U)
X, Y, M, L,
SM, F, B, SB,
FX, FY
J\ T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U\G, J\,
U3E\(H)G
Z LT, LST,
LC
LZ K, H E $
(U)
*1
*3
(s1)
*4
(s2)
*4
(d)
*2
*5
Operand: (s1)
Device Item Description Setting range Set by
+0 Send channel Specifies the send channel.
• 1: Channel 1 (CH1 side)
• 2: Channel 2 (CH2 side)
1, 2 User
+1 Result of sending Used to store the result of sending with the G(P).ONDEMAND instruction.
•0: Normal
• Other than 0: Error (error code)
System
+2 Amount of send data Specifies the amount of the data to be sent.
*1
1 or more User
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