Mitsubishi Electric FX5-DP-M, User Manual

Page: 33 / 176

4 FUNCTIONS
4.3 PROFIBUS-DPV1
31
4
Services available on the FX5-DP-M
For Acyclic communication, a Class 1 service is available.
Check 'Slave status area (Normal communication detection)' (Un\G23040 to Un\G23043) for whether bits relevant to the
targets are on before executing a Class 1 service.
*1 Data readable/writable by READ and WRITE services differs depending on the DP-Slave used.
For details, refer to the following.
Manuals for the DP-Slave
Execution of Acyclic communication function
Execute the Acyclic communication function by the following procedure.
1.
Set the request instruction data (request code or FDL address) to 'Acyclic communication request area' (Un\G23809 to
Un\G24832) using a request format. (
 Page 150 Acyclic communication request area (Un\G23809 to Un\G24832))
2.
Turn on bits of 'Acyclic communication request execution instruction area' (Un\G23808) that are relevant to the request
instruction numbers to execute. (
 Page 150 Acyclic communication request execution instruction area (Un\G23808))
3.
When the FX5-DP-M accepts the Acyclic communication request instructions, the acceptance statuses of 'Acyclic
communication request result area' (Un\G25120) turns on. (
 Page 152 Acyclic communication request result area
(Un\G25120))
4.
When Acyclic communication is completed, the request execution completed statuses of 'Acyclic communication request
result area' (Un\G25120) turns on and the request execution result is stored in 'Acyclic communication response area'
(Un\G25121 to Un\G26144). (
 Page 152 Acyclic communication response area (Un\G25121 to Un\G26144))
5.
Turn off bits of 'Acyclic communication request execution instruction area' (Un\G23808) that are relevant to the request
instruction numbers to execute.
6.
When Acyclic communication is completed, the request acceptance status and request execution completion status of
'Acyclic communication request result area' (Un\G25120) turn off.
• Communications with DP-Slaves may be initialized if a problematic cable or noise causes a problem to the
communications during a Class 1 service. (Input and output are turned off)
• For a program example of the Acyclic communication function, refer to the following.

Page 109 Program Example of Acyclic Communication (Acyclic Communication)
Service name Description
READ service Reads data from a specified DP-Slave.
*1
WRITE service Writes data to a specified DP-Slave.
*1