Mitsubishi Electric Melsec A Series - Notes on System Construction

2. SYSTEM CONFIGURATION
-------------------- MELSEC-A
2.2 Notes on System Construction
(1) Connection of remote I/O modules and remote terminal modules
A maximum of 64 stations of remote I/O modules and remote terminal
modules can be connected to the A2C.
Also,
the MINI-S3Iink disclose devices can be connected. (See Section
2.3.)
(2) Applicable remote terminal modules
I
A maximum of 14 remote terminal modules among those mentioned
below can be connected
to the A2C. However, when the AJ35PTF-R2
RS-232C interface module is used, up to 7 modules can be connected.
(a) A68ADC A/D conversion module
(b) A64DAVC D/A conversion module •
(c) A64DAIC D/A conversion module
(d) AD61C high speed
counter module
(e) AJ35PTF-R2 RS-232C interface module (no-protocol mode only)
(3) Use of the MINI-S3 link modules
The following restrictions are applied when the MINI-S3 link remote I/O
..
modules and remote terminal modules are used. ..
(a) Twisted-pair data link module:
No restriction is applied.
(b) Optical/twisted-pair data link
module:
When twisted-pair shield cables are used, no restriction is ap-
plied. •
When an optical data link module is used, use
this module to
switch the twisted-pair shield cable data link with
the fiber-optic
cable
data link.
(c) Optical
data link module:
Usable when the optical/twisted-pair data link module is used as
the optical data link module.
2-3